It is a pretty small sample size, and when he joined the team, last August, not only should an adjustment period be given, the team and staff were in chaos. McGuire never caught Nate, Houck or Wacha and hardly caught any of Whitlock and Strahm. That's maybe 5 of our best 7 pitchers of 2022. (Hill & Schreiber being the other two, and RM did not catch more of them than his share.)
With all the change-overs from 2022 to 2023, it's like a brand new staff.
Here are the pitchers he caught the most in 2023 by PAs Against:
186 Pivetta
120 Hill
110 Crawford
67 Bello
67 Brasier
60 Schreiber
52 Barnes
46 Ort
45 Winck
41 Davis
35 Seabold
31 Danish
30 Sawamura
29 Bazardo
26 Familia
While the bottom 6 on this list do not have large sample sizes, their total PA is 192, which is more than with Pivetta.
Look how McGuire's PAA list compares to the full season list of PAs Against by Sox pitchers:
773 Pivetta
526 Hill (120 w RM)
515 Wacha (0 w Rease McGuire- a huge disparity)
460 Nate (0 w RM- a huge disparity)
334 Crawford
316 Winck
311 Whitlock (only 21 w RM- a huge disparity)
268 Bello (only 67 w RM)
263 Brasier
257 Schreiber (only 60 w RM)
254 Davis
247 Houck (0 w RM)
221 Sawamura
193 Strahm (only 19 w RM)
176 Barnes
134 Ort
111 Robles
As you can see by the pitchers highlighted in red, RM hardly caught 5 of our very best pitchers.
The biggest disparities in RM's favor (meaning more PAs w Reese than an even distribution would be) were Pivetta, Hill and Crawford- not really our best pitchers, except for Hill.
It was large an apples and oranges scenario, last year.
The two game sample size of 2023 does look frightening, as did the ST'ing numbers, but I think there is still an adjustment period underway. Sale and Kluber are new to RM.
OPSA in 2023:
1.168 w McGuire
1.460 Kluber (19 PAs)
1.526 Sale (19 PAs)
1.125 Ort (9)
1.270 Kelly (9)
.286 Wink (7)
1.214 Brasier (7)
.650 Jansen (5)
1.167 Schreiber (4)
.000 Martin (3)
with Wong (.844):
1.100 Martin (5)
.400 Wink (5)