MLB Daily DeltaWeek 27 · September 28, 2026
Portrait of George Kirby
George Kirby
SEA · P
Change to
Portrait of Jack Flaherty
Jack Flaherty
DET · 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

George Kirby wins 1 (ERA); Jack Flaherty 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
George Kirby
96.7
Jack Flaherty
92.7
Swinging-Strike %lg 11.0% · higher = better
George Kirby
11.7%
Jack Flaherty
12.2%
Strikeout %lg 22.0% · higher = better
George Kirby
20.0%
Jack Flaherty
26.2%
Chase %lg 28.5% · higher = better
George Kirby
34.3%
Jack Flaherty
27.6%
Hard-Hit % Allowedlg 40.0% · lower = better
George Kirby
40.1%
Jack Flaherty
46.2%
Barrel % Allowedlg 8.0% · lower = better
George Kirby
6.6%
Jack Flaherty
8.4%
xwOBA Allowedlg .315 · lower = better
George Kirby
.315
Jack Flaherty
.323
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
George Kirby
2.956.63
lg xERA 4.10
now 3.77
4.17
Jack Flaherty
2.956.63
lg xERA 4.10
now 5.81
4.33
WHIPlower is better
George Kirby
1.061.77
now 1.22
1.39
Jack Flaherty
1.061.77
now 1.61
1.36

Volume · rest of season
Strikeoutshigher is better
George Kirby
4089.60
now 59
0
Jack Flaherty
4089.60
now 64
0
Winshigher is better
George Kirby
.0007
now 5
0–0
Jack Flaherty
.0007
now 0
0–0

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

If you already own them — trade angle
Hold · steadyGeorge Kirby — hold.conf 0.60
SellJack Flaherty — sell.conf 0.66
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