MLB Daily DeltaWeek 27 · September 28, 2026
Portrait of Stephen Kolek
Stephen Kolek
KC · P
Change to
Zac Thornton
NYM · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 1–1, 2 even. Take whoever fills a bigger need.

Head-to-head
K
◀
ERA
WHIP
▶
W
SV n/a

Stephen Kolek wins 1 (ERA); Zac Thornton wins 1 (WHIP); 2 even; SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Stephen Kolek
94.2
Zac Thornton
92.3
Swinging-Strike %lg 11.0% · higher = better
Stephen Kolek
9.6%
Zac Thornton
9.3%
Strikeout %lg 22.0% · higher = better
Stephen Kolek
15.2%
Zac Thornton
18.7%
Chase %lg 28.5% · higher = better
Stephen Kolek
26.7%
Zac Thornton
32.7%
Hard-Hit % Allowedlg 40.0% · lower = better
Stephen Kolek
36.9%
Zac Thornton
41.1%
Barrel % Allowedlg 8.0% · lower = better
Stephen Kolek
6.8%
Zac Thornton
9.5%
xwOBA Allowedlg .315 · lower = better
Stephen Kolek
.303
Zac Thornton
.325
stabilized — trust it · small sample yet · dashed = league avg · right = better
05

The tape

Rest-of-season projection · bold = leads
rest-of-season projection current season projection range
Rate · earned-run quality
ERAlower is better
Stephen Kolek
3.124.73
lg xERA 4.10
now 3.48
3.87
Zac Thornton
3.124.73
lg xERA 4.10
now 4.35
4.37
WHIPlower is better
Stephen Kolek
.9001.47
now 0.94
1.32
Zac Thornton
.9001.47
now 1.16
1.25

Volume · rest of season
Strikeoutshigher is better
Stephen Kolek
4026.60
now 19
0
Zac Thornton
4026.60
now 10
0
Winshigher is better
Stephen Kolek
.0004.20
now 3
0–0
Zac Thornton
.0004.20
now 0
0–0

SV — not applicable. Both pitch out of the rotation.

If you already own them — trade angle
Hold · leans buyStephen Kolek — hold.conf 0.60
Sell HighZac Thornton — sell high. His value is peaking; good time to trade him.conf 0.95
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