Ji'Ayir Brown
Top 43% all-time defensive backsDurable Contributor
Height5'11"
Weight202 lb
BornJan 25, 2000
Age26
ConferenceBig Ten
Rookie yr2023
Draft2023 Β· Rd 3, Pick 87 Β· SF
A defensive back who maximized value through exceptional availability β almost never missed time. Their middle-tier career was extended by consistently being on the field.
Career Value Β· VORP
VORP 47 Β· #2142 Β· Above AverageWorth 47 points of value above a freely-available replacement safety β top 47% of all 4,642 ranked at the position. 3 of 3 seasons cleared the replacement bar, by +15.7 on average.See board β
Seasons above replacement
3 cleared
Beat replacement (adds to VORP) Below it β adds 0, never a debit
48
Replacement
the KC-H bar
β
3
Seasons over
cleared the bar
Γ
+15.7
Avg surplus
peak +20
3 seasons Γ ~15.7 surplus β VORP 47
Combined Season Grid
The full season-by-season grids, joined on one timeline. Every selected stat family stays visible at onceβno tab hopping.
3 grids split in one view
| 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 | SF | 9 | β | 34 | 21 | 13 | 0 | 0 | 0.0 | 0.0 | 2 | 4 | 0 | β | 0 | 0 | β | 0.0% | 395 | 60.5% | 173 | 44.9% | 16 | 10 | 0.6 | 78.4 | 11.6 | 1 | 1 | 0 | 6 | 4 | 0.1 |
| 2024 | β | SF | 17 | β | 71 | 42 | 29 | 3 | 0 | 0.0 | 3.0 | 1 | 6 | 0 | β | 0 | 0 | β | 0.0% | 886 | 83.4% | 116 | 25.1% | 49 | 28 | 0.6 | 80.7 | 10.6 | 0 | 0 | 0 | 8 | 7 | 0.1 |
| 2025 | β | SF | 15 | β | 75 | 43 | 32 | 2 | 0 | 0.0 | 2.0 | 2 | 6 | 1 | β | 0 | 0 | β | 0.0% | 801 | 74.4% | 145 | 32.9% | 43 | 28 | 0.7 | 102.4 | 9.5 | 0 | 0 | 0 | 8 | 5 | 0.1 |
| Career | β | 41 | β | 180 | 106 | 74 | 5 | 0 | 0.0 | 5.0 | 5 | 16 | 1 | β | 0 | 0 | β | 0.0% | 2,082 | 72.8% | 434 | 34.3% | 108 | 66 | β | β | β | 1 | 1 | 0 | 22 | 16 | β | |
Defense
Snap Counts
Advanced Defense & Coverage (2018+)
KV-H Anatomy
KV-H 54 Β· SolidA solid career by KV-H: a remarkably steady profile that scores 54 of 100, era-normalized against int/g peers across 3 scored seasons, with a short career trimming the score.
63
Sustained
career value
Γ.6
64
Peak
best 3 seasons
Γ.4
Γ0.86
Longevity
career length
Blend 63.4 Γ longevity 0.86 = KV-H 54Β· confidence 100%
What builds the career mark of 63
On-field 45.9
Availability 17.1
On-field production Staying available
Season-by-season quality (era-relative int/g)
2023bestavg 642025
All-Time Standing
how this career measures against the all-time greats at the position2
Depth
of 100
Reached 2% of the all-time Interceptions leader β a rotational/depth all-time profile at the position.
2% of the all-time Interceptions leader2
0 categories β₯25% of the all-time leader0
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: 93%.
Per-Snap Impact
Defensive Backs Β· proprietary Β· 2012+35
Rotational
SIS
Disruption/1001.297Snap share72.8%Def snaps2,082ConsistentCV 0.12
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+).
Career Aging Trajectory
vs. position group average Β· KV-H basisAmber = this player (normalized to own peak). Indigo = average defensive backs aging curve. Group peak age: 21. Source: StatVault KV-H era (1999+).
Combine Β· 2023
Percentiles compare each raw measurement against position peers, the full combine pool, and the same draft class where enough samples exist.
4.65s
40-Yard
32.5"
Vertical
119"
Broad Jump
18 reps
Bench
Postseason Career
3 playoff gamesDefense
Tkl25Solo14Ast11Int1PD1
College stats are not imported for this profile yet.
StatVault has the verified college attribution (Penn State; Lackawanna JC), 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.
Reference Graph
Career teammates and draft class, derived from year-by-year rosters β every name is linked.
Top Teammates
Kyle JuszczykFB3yTrent WilliamsOT3yGeorge KittleTE3yFred WarnerMLB3yChristian McCaffreyRB3yJake BrendelC3yNick BosaDE3yDeommodore LenoirCB3yJauan JenningsWR3yKevin GivensDT3yColton McKivitzOT3yJake MoodyK3yBrock PurdyQB3yDee WintersLB3ySpencer BurfordG3yKalia DavisDT3yNick ZakeljOT3yDarrell Luter Jr.CB3yRobert Beal Jr.DE3yCurtis RobinsonLB3yBrayden WillisTE3yJalen GrahamLB3yTashaun GipsonFS2yJavon HargraveNT2y
2023 Draft ClassΒ· this player went #87
Franchise Succession
the room, before and afterJi'Ayir inherited the San Francisco 49ers DB room from Tashaun Gipson (2022β2024), and handed it to Renardo Green (2024β2025).
Similar Players
Statistical + physical similarity across every player in the database, position-relevant (0β100%).
Movementderived from season history
- 2025final season
Last recorded season with SF
- 2023draft
Drafted by SF β Round 3, Pick 87
Athletic & Unique Profile
verified measurements and curated source-tagged facts5'11" / 202 lb
Frame
203 lb at 4.65s
Size-speed
32.5" vert / 119" broad
Explosion
18 reps
Bench power
Injury History
2 career games missed (Out)From nflverse weekly injury reports Β· coverage begins 2009.
| Season | Team | Games Out | Designations |
|---|---|---|---|
| 2024 | SF | 0 | W17QuestionableΒ· AnkleW18QuestionableΒ· Ankle |
| 2023 | SF | 2 | W17OutΒ· KneeW18OutΒ· Knee |
Knox
StatVault's proprietary player intelligence, informed by full career data. How Knox works β
Historical Knox Β· KV-H
Era-normalized career quality β z-scored against 3-season peers. See all β
54
peak 64
Season Report CardsΒ· KV-H era-normalized per season
B2023
C+2024
B2025
Availability
Career durability β games played vs. scheduled, across 3 seasons.
96%
20232025
Durability IQ
Composite score across availability, IR frequency, and injury severity.
Era Translator
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 | 4+2 | 0.2 |
| 2024 | 1 | 0.1 | 1 | 0.1 |
| 2025 | 2 | 0.1 | 2 | 0.1 |
Data: nflverse:players, nflverse:player_stats_def, nflverse:snap_counts, nflverse:combine, nflverse:draft_picks, nflverse:injuries Β· multi-source verified via the StatVault Oracle Β· updated 6/18/2026
Career Value Β· VORP
47 career value over replacement β #2142 all-time of 4,642. 15.7/season above a replacement-level S.
Draft OutcomeValue β
Pick #87 (Rd 3) Β· SF Β· 2023 Β· +15.3 vs expected KV-H
54actual
38.7 expected Β· Ξ+15.3
Fan Rating
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