A defensive back who maximized value through exceptional availability β almost never missed time. Their developmental was extended by consistently being on the field.
Worth 30 points of value above a freely-available replacement safety β top 59% of all 4,642 ranked at the position. 3 of 3 seasons cleared the replacement bar, by +10 on average.See board β
Seasons above replacement
3 seasons Γ ~10 surplus β VORP 30
The full season-by-season grids, joined on one timeline. Every selected stat family stays visible at onceβno tab hopping.
| Season | Age | Team | G | GS | Defense | Snap Counts | Advanced Defense & Coverage (2018+) | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tkl | Solo | Ast | TFL | QBHits | Sk | Dis | Int | PD | FF | FR | TD | Sfty | Off | Off% | Def | Def% | ST | ST% | Tgt | Cmp | Cmp% | RateAll | ADOT | Prss | Hrry | QBKD | Bltz | MissTkl | Miss% | |||||
| 2023 | β | WAS | 13 | β | 39 | 25 | 14 | 1 | 1 | 1.0 | 3.0 | 2 | 4 | 0 | β | 0 | 0 | β | 0.0% | 365 | 43.2% | 228 | 61.5% | 30 | 20 | 0.7 | 86.4 | 5.6 | 1 | 0 | 0 | 14 | 5 | 0.1 |
| 2024 | β | WAS | 16 | β | 74 | 42 | 32 | 2 | 1 | 0.0 | 3.0 | 1 | 3 | 2 | β | 0 | 0 | β | 0.0% | 943 | 93.1% | 111 | 26.6% | 28 | 14 | 0.5 | 75.3 | 13.0 | 1 | 0 | 1 | 5 | 7 | 0.1 |
| 2025 | β | WAS | 17 | β | 99 | 52 | 47 | 1 | 2 | 0.0 | 3.0 | 0 | 3 | 1 | β | 0 | 0 | β | 0.0% | 927 | 81.9% | 153 | 35.8% | 48 | 35 | 0.7 | 154.5 | 11.8 | 3 | 1 | 2 | 6 | 10 | 0.1 |
| Career | β | 46 | β | 212 | 119 | 93 | 4 | 4 | 1.0 | 9.0 | 3 | 10 | 3 | β | 0 | 0 | β | 0.0% | 2,235 | 72.8% | 492 | 41.3% | 106 | 69 | β | β | β | 5 | 1 | 3 | 25 | 22 | β | |
A solid career by KV-H: a remarkably steady profile that scores 50 of 100, era-normalized against int/g peers across 3 scored seasons, with a short career trimming the score.
Blend 57.4 Γ longevity 0.86 = KV-H 50Β· confidence 100%
Season-by-season quality (era-relative int/g)
Reached 1% of the all-time Interceptions leader β a rotational/depth all-time profile at the position.
A 0β100 scale where 100 = matched the all-time leaderat this position. Built only from visible encyclopedia data β career production vs. the all-time leader, plus efficiency (EPA) and comparable-player confidence β so it's a transparent context score, not a subjective rating. Tiers: Elite β₯ 85 Β· Strong β₯ 65 Β· Solid β₯ 45 Β· Depth < 45. Comparable-player confidence: 92%.
Production per snap β the box score normalized by opportunity. SIS is z-scored within defensive backs, shrinkage-regularized so small samples don't spike, over the NFL snap-count era (2012+).
Amber = this player (normalized to own peak). Indigo = average defensive backs aging curve. Group peak age: 21. Source: StatVault KV-H era (1999+).
Percentiles compare each raw measurement against position peers, the full combine pool, and the same draft class where enough samples exist.
Career teammates and draft class, derived from year-by-year rosters β every name is linked.
Quan inherited the Washington Commanders DB room from Benjamin St-Juste (2021β2024), and handed it to Mike Sainristil (2024β2025).
Statistical + physical similarity across every player in the database, position-relevant (0β100%).
Last recorded season with WAS
Drafted by WAS β Round 2, Pick 47
From nflverse weekly injury reports Β· coverage begins 2009.
| Season | Team | Games Out | Designations |
|---|---|---|---|
| 2024 | WAS | 0 | W2QuestionableΒ· HamstringW18QuestionableΒ· Illness |
| 2023 | WAS | 1 | W2OutΒ· Concussion |
StatVault's proprietary player intelligence, informed by full career data. How Knox works β
Era-normalized career quality β z-scored against 3-season peers. See all β
Career durability β games played vs. scheduled, across 3 seasons.
Composite score across availability, IR frequency, and injury severity.
INT translated to the 2025NFL β each season's standing among its own-era peers, projected onto 2025's scoring environment. Modern-era (1999+) coverage.
| Season | Actual INT | INT/G | β 2025 INT | β 2025 /G |
|---|---|---|---|---|
| 2023 | 2 | 0.2 | 3+1 | 0.1 |
| 2024 | 1 | 0.1 | 1 | 0.1 |
| 2025 | 0 | 0 | 0 | 0 |
Data: nflverse:players, nflverse:player_stats_def, nflverse:snap_counts, nflverse:combine, nflverse:draft_picks, nflverse:injuries, wikipedia:college-stats (CC-BY-SA, facts-only) Β· multi-source verified via the StatVault Oracle Β· updated 6/18/2026
Career Value Β· VORP
30 career value over replacement β #2688 all-time of 4,642. 10/season above a replacement-level S.
Pick #47 (Rd 2) Β· WAS Β· 2023 Β· +0.2 vs expected KV-H
Fan Rating
Rate Quan Martin β All-Time
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Gave the Washington Commanders an entire corpus-attributed career β 3 seasons (2023β2025), one crest. The rarest loyalty in the sport.