Mithrandir Metrics
Player Los Angeles Angels Refreshed Jun 1 06:00 AM ET
Player profile / Los Angeles Angels

Jack Kochanowicz

P profile with live context, projection links, and Mithrandir card history when available.

Cards
14
Modules
1
Live Δ
yes
Club Los Angeles Angels Position P Roster Active Status Healthy / active roster
Rolling projection

Preseason / current pace / Bayesian update

Rolling bands shrink current-season signal toward the preseason prior until the sample earns more weight.

2026-06-01
ERA preseason4.64
ERA current pace4.99
ERA rolling p504.84
Observed weight57%
ERA
3.47 4.12 4.84 5.56 6.20
FIP
3.78 4.17 4.60 5.03 5.42
K%
13.9% 15.3% 16.9% 18.5% 19.9%
BB%
8.5% 9.3% 10.1% 11.0% 11.8%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-01
Pitching · percentile strip
BB%12.0%
15 -40 vs proj
Barrel allowed7.5%
52
Fastball velo95.9
75
Hard-hit allowed43.9%
23
K%17.7%
17
Whiff%23.4%
54 +30 vs proj
xwOBA allowed0.354
14
Mithrandir+

Stuff+ and arsenal context

Stuff+ appears when the current pitch-event scoring artifact includes this pitcher; missing coverage is shown explicitly.

2026-06-01
Mithrandir Stuff+98
22
Rolling form chart

xwOBA allowed snapshot line

Live snapshot series; true 50/100 PA windows require PA-level logs

12 snapshots
Mithrandir Metrics ROLLING XWOBA LINE Parameterized Mithrandir chart rendered as SVG for templates and exports. season=2026 Rolling xwOBA allowed Kochanowicz, Jack · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 2026-05-17: 0.3652026-05-19: 0.3652026-05-21: 0.3652026-05-23: 0.3522026-05-24: 0.3512026-05-25: 0.3512026-05-26: 0.3512026-05-28: 0.3482026-05-29: 0.3482026-05-30: 0.3482026-05-31: 0.3482026-06-01: 0.354 2026-05-17 2026-06-01 xwOBA allowed MITHRANDIR · CHARTS
Optimization map

Arsenal optimization map

Pitch-shape context from this pitcher’s current arsenal snapshot. Hover a pitch to inspect usage, movement, and bat-missing context.

4Pitches 2026Season 38%Top usage
ride armside gloveside +Arsenal gap +Shape contrast
Zone profile

Aggregate zone heatmap

Aggregate zone metrics from seasonal Statcast leaderboards.

Mithrandir Metrics ZONE HEATMAP Parameterized Mithrandir chart rendered as SVG for templates and exports. season=2026 Pitch Zone Profile Kochanowicz, Jack · Aggregate zone metrics; not pitch-by-pitch locations Edge: 40%40%Zone: 47%47%Whiff: 23%23%Called strike: 15%15%First pitch strike: 44%44%Hard hit allowed: 44%44% Dashed border = aggregate mixed-batter zone proxy MITHRANDIR · CHARTS
Pitch arsenal

Usage mix, movement map, and Stuff+ composition

2026 pitch-level arsenal aggregates; current season takes over after 100 tracked pitches across at least 2 pitch types. Descriptive pitch-type Stuff+ composition. Not a promoted predictive metric.

2026
Mithrandir Metrics PITCH ARSENAL DONUT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Kochanowicz, Jack · 2026 arsenal snapshot Sinker: 38.1%Changeup: 23.5%4-Seam Fastball: 20.8%Slider: 17.6% MIX SI 38%CH 24%FF 21%SL 18% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Kochanowicz, Jack · 2026 arsenal snapshot SI: HB 0.1, IVB 2.1SICH: HB -0.4, IVB 2.7CHFF: HB -0.2, IVB 1.3FFSL: HB -0.2, IVB 3.4SL horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SI 38.7% 413 98 qualified
CH 23.2% 248 104 qualified
FB 21.4% 229 96 qualified
SL 16.7% 178 93 limited sample
Method note

Renamed from the attempted Kirby Index after audit; true Kirby requires release-angle trajectory data.

Reference layer

Current snapshot

Age25
Height6' 7"
Weight228 lb
Debut2024-07-11
Live layer

Delta / regression

ERA Δ-0.34
K% Δ+0.016

negative regression

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching142026-05-26Changeup played up through CH/FF tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202616.0% K | 5.33 ERAProjection
2026-05-20 vs ATH3 ER / 7 K6.0 IP
2026-04-15 @ NYY3 ER / 6 K6.2 IP
2026-04-04 vs SEA0 ER / 7 K5.2 IP
2026-03-29 @ HOU5 ER / 3 K4.0 IP