Byron Leftwich is a career quality starter — a quarterback whose body of work places Leftwich in the top half of all players at the position historically. The Knox model values sustained contribution over flash, and Leftwich's career arc reflects exactly that kind of reliable professional-grade performance.

QBPIT#4ACT

Byron Leftwich

Top 30% all-time QBsHigh-End Starter📉 Fades · -23% playoffs 🌅 Early Bloomer · 2004 Team Carrier · #323

Height6'5"

Weight250 lb

BornJan 14, 1980

Age46

College

Team Carrier Evidence

Ranked #323 of 600 by seasons where high individual production happened on low-win teams. Score aggregates only tracked StatVault categories.

Full board

Total Score

2 qualifying seasons

2003 JAX·5 team wins#19

Passing Yards · 2,819 · score 14

2003 JAX·5 team wins#19

Passing Touchdowns · 14 · score 14

All-Time Standing

how this career measures against the all-time greats at the position

Career Value · VORP

55 career value over replacement — #1932 all-time of 4,649. 11/season above a replacement-level QB.

Draft OutcomeMiss ↓

Pick #7 (Rd 1) · JAX · 2003 · -11.4 vs expected KV-H

50actual

61.4 expected · Δ−11.4

Fan Rating

Rate Byron Leftwich — All-Time

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Compare Byron Leftwich vs Player Report data error

Depth

of 100

Reached 12% of the all-time Passing Yards leader — a rotational/depth all-time profile at the position.

12% of the all-time Passing Yards leader12

0 categories ≥25% of the all-time leader0

A 0–100 scale where 100 = matched the all-time leaderat this position. Built only from visible encyclopedia data — career production vs. the all-time leader, plus efficiency (EPA) and comparable-player confidence — so it's a transparent context score, not a subjective rating. Tiers: Elite ≥ 85 · Strong ≥ 65 · Solid ≥ 45 · Depth < 45. Comparable-player confidence: 89%.

Encyclopedia Coverage5/8 data layers

StatVault aggregates multiple open-licensed and proprietary sources into a single profile. The depth indicator above shows which layers are available for this player.

Bio & DraftBirth date, height/weight, draft round/pick, college — sourced from nflverse players.csv (CC-BY 4.0). Covers all NFL eras.

Season Stats (1999–present)Week-by-week box scores aggregated to season totals: passing, rushing, receiving, defense. Source: nflverse player_stats. Counting stats are exact; rates are derived.

Advanced (EPA, 1999–present)Not available for this player

Snap Counts (2012–present)Not available for this player

Defensive StatsNot available for this player

College StatsCollege attribution is present, but this profile artifact does not yet carry a parsed college stat table.

NFL Combine / Pro Day40-yard dash, vertical, broad jump, 3-cone, shuttle, bench press. Source: nflverse combine.csv.

Proprietary LayersKV-H (Knox Value-Historical) — era-normalized career rating 0–100 calibrated within position group (1999+ coverage). SIS (Snap Impact Score, 2012+) — per-snap production z-scored within position. VORP — value over replacement player. Durability IQ — games-played percentile adjusted for era.

Pre-1999 players have bio + draft data but counting stats are not available from any freely-licensed source. Players with ★ Career Only see verified career aggregates from nflverse draft_picks.

Career Aging Trajectory

vs. position group average · KV-H basis

Amber = this player (normalized to own peak). Indigo = average QBs aging curve. Group peak age: 24. Source: StatVault KV-H era (1999+).

Combine · 2003

Percentiles compare each raw measurement against position peers, the full combine pool, and the same draft class where enough samples exist.

QB · 2003 class

4.85s

40-Yard

Below avg · 37th pct

Pos 37thAll 33thClass Pos 41thClass All 36th

Playoff vs Regular Season

📉 Regular Season Player

Passer Rating: 78.2 regular season → 60.4 playoffs (2 playoff seasons)

-23%

vs reg season

Career Milestones5

Major career thresholds crossed, derived from regular-season totals (1999+).

20031K career passing yards
20045K career passing yards
200425 career passing TDs
200650 career passing TDs
200910K career passing yards

Understanding These Stats

Passing

Cmp / Att — Completions and pass attempts.

Cmp% — Completion percentage — completions ÷ attempts × 100.

Yds — Passing yards — total air + yards after catch on completions.

TD / TD% — Passing touchdowns. TD% = TDs per 100 attempts, measuring scoring efficiency.

Int / Int% — Interceptions thrown. Int% = INTs per 100 attempts — the primary ball-security metric.

Y/A — Yards per attempt — passing yards ÷ attempts. The core passing efficiency rate.

AdjY/A — Adjusted yards per attempt: (Pass Yds + 20×TD − 45×INT) ÷ Att. Penalizes turnovers and rewards touchdowns — widely considered the most predictive single-season QB metric.

TD:INT — TD-to-interception ratio — passing touchdowns ÷ interceptions thrown. Elite QBs sustain career ratios above 3.0; HOF greats often exceed 4.0. Not shown when no interceptions.

Rate — NFL passer rating — the official formula combining Cmp%, Y/A, TD%, and INT% on a 0–158.3 scale. Good QB performance ≈ 90+; elite ≈ 110+.

Sk — Times sacked — how many times the QB was brought down behind the line of scrimmage.

Rushing

Att — Rushing attempts (carries).

Yds — Rushing yards.

TD — Rushing touchdowns.

Y/A — Yards per carry — rushing yards ÷ carries. The core rushing efficiency rate; 4.5+ is solid, 5+ is elite.

TD% — Touchdown rate per carry (TDs ÷ carries × 100) — measures scoring efficiency per touch independent of volume. Red-zone workhorses lead here.

1D — First downs gained on rushing plays.

1D% — First-down conversion rate (first downs ÷ carries × 100) — how often a carry moves the chains. Top RBs convert on 25%+ of attempts.

Fmb — Rushing fumbles lost — the key ball-security stat for running backs. Below 1 per season is elite.

Receiving

Tgt — Targets — how many times the receiver was thrown to, regardless of completion.

Rec — Receptions — catches made.

Yds — Receiving yards.

TD — Receiving touchdowns.

Ctch% — Catch rate — receptions ÷ targets × 100. Measures how reliably a receiver turns opportunities into gains. 70%+ is elite.

Y/R — Yards per reception — receiving yards ÷ receptions. Measures big-play ability; 15+ is elite for WRs.

Y/Tgt — Yards per target — receiving yards ÷ targets. The single most complete receiving efficiency metric: accounts for both drops and incomplete targets. Elite receivers post 8+ yards per target.

AirYd/T — Air yards per target — average depth of route at time of target. High values indicate a deep threat role; low values indicate a slot/check-down role.

1D — First downs gained on receiving plays.

Proprietary StatVault Metrics

KV-H (Knox Value-Historical) — Era-normalized career rating 0–100 within position group, calibrated so a 50 = average starter and 90+ = all-time great. Covers 1999–present. Built on a 5-year IQR/robust-std era window.

SIS (Snap Impact Score) — Per-snap production z-scored within position group and era (2012+). Measures how much a player produced per opportunity, not raw volume.

VORP (Value Over Replacement) — Sum of max(0, season KV-H − positional replacement level) across a career. Measures career value above the minimum-roster baseline at each position.

Durability IQ — 0–100 score reflecting how many games a player played relative to peers at the same position in the same era. Adjusts for injury-shortened seasons.

Postseason Career

2 playoff games

Passing

Cmp18Att32Cmp%56.3%Yds179Int1Int%3.1Y/A5.6AdjY/A4.2Rate59.2Sk4

Rushing

Att7Yds24Y/A3.41D11D%14.3

College Stats

MarshallCollege listed; stat table pending import

College stats are not imported for this profile yet.

StatVault has the verified college attribution (Marshall), but no parsed college box-score table is present in this profile artifact. The section stays here so every profile has a consistent college-stats landing point without fabricating unavailable rows.

Franchise Succession

the room, before and after

Byron inherited the Jacksonville Jaguars QB room from David Garrard (2002–2010), and handed it to Blake Bortles (2014–2018).

Mark Brunell 1995–2003David Garrard 2002–2010Byron Leftwich 2003–2006Blake Bortles 2014–2018Gardner Minshew 2019–2020Trevor Lawrence 2021–2025

The room is reconstructed from arrival order among durable members (≥4 seasons with the club) at the player’s position group — a lineage by arrival, not a week-by-week depth chart. Distinct from the league-wide positional GOAT torch.

Movementderived from season history

2012final season
Last recorded season with PIT
2010team change
Joined PIT (from TB)
2009team change
Joined TB (from PIT)
2008team change
Joined PIT (from ATL)
2007team change
Joined ATL (from JAX)
2003draft
Drafted by JAX — Round 1, Pick 7

Athletic & Unique Profile

verified measurements and curated source-tagged facts

6'5" / 250 lb

Frame

241 lb at 4.85s

Size-speed

Injury History

3 career games missed (Out)

From nflverse weekly injury reports · coverage begins 2009.

Season	Team	Games Out	Designations
2012	PIT	2	W12Out· RibsW13Out· RibsW14Questionable· Ribs
2010	PIT	1	W1Out· Knee
2009	TB	0	W4Questionable· HipW10Questionable· right Elbow

Knox

StatVault's proprietary player intelligence, informed by full career data. How Knox works →

Historical Knox · KV-H

Era-normalized career quality — z-scored against 5-season peers. See all →

peak 54

Season Report Cards· KV-H era-normalized per season

C+2003

C+2004

C+2005

D2006

F2008

Availability

Career durability — games played vs. scheduled, across 9 seasons.

42%

20032012

2005 · cause not documented · 69%2006 · cause not documented · 38%2007 · cause not documented · 19%2008 · cause not documented · 31%2009 · cause not documented · 19%2010 · Knee · 6%2012 · Ribs · 13%

Durability IQ

Composite score across availability, IR frequency, and injury severity. See all →

Fragile

Era Translator

Pass Yds translated to the 2025NFL — each season's standing among its own-era peers, projected onto 2025's scoring environment. Modern-era (1999+) coverage.

Season	Actual Pass Yds	Pass Yds/G	→ 2025 Pass Yds	→ 2025 /G
2003	2,819	187.9	3,418+599	201.1
2004	2,941	210.1	3,791+850	223
2005	2,123	193	3,590+1,467	211.2
2006	1,158	193	3,578+2,420	210.5
2008	303	60.6	1,977+1,674	116.3

Data: nflverse:players, nflverse:player_stats, nflverse:combine, nflverse:draft_picks, nflverse:injuries · multi-source verified via the StatVault Oracle · updated 7/31/2026

Career Geography

Journeyman · 4 crestsLeague board →

Wore 4 distinct franchise crests across 10 seasons (2003–2012) — a true nomad. The crest trail:

JAX 2003–2006 ATL 2007 PIT 2008–2012 TB 2009

Byron Leftwich

Team Carrier Evidence

All-Time Standing

Career Aging Trajectory

Combine · 2003

Postseason Career

Passing

Rushing

College Stats

Reference Graph

Top Teammates

2003 Draft Class· this player went #7

Franchise Succession

Similar Players

Movementderived from season history

Athletic & Unique Profile

Injury History

Knox

Era Translator

Career Geography