As much as we have crapped on Sale and Paxton, the last couple years, they were 4th and 5th in SP IP for the team, last year and had the 3rd and 4th best ERAs out of our 8 SP'ers with 7 plus starts.
Combined, they started 39 games and were 1 & 1/3 of an inning from 200 IP. That seems hard to replace by Gio, as the most he can start is maybe 33-34 games. However, those two are not the only SP'ers we lost and need to replace.
(Team SP ERA: 4.68 as a reference point)
4.30 Sale 20 GS/103 IP
4.50 Paxton 19 GS/96 IP
6.26 Kluber 9 GS/42 IP
plus 16 GS'd by openers and the likes of Dermody & Garza
In the 47 GS by Sale, Paxton & Kluber, they combined for a 4.72 ERA (126 ER in 240.1 IP). That is slightly higher than the team SP ERA.
The numbers for those 16 scrub starts:
5.47 ERA (24.2 IP and 15 ERs)
They averages about 1 1/2 IP per start, which really taxed the pen, mightily, and often the opener was a RP'er.
So, who gets the 47 GS lost plus the 16 odd starts? That's 62 GS to replace. (4.79 ERA in those 62 GS.)
Here is my stab at the question, assuming everyone is healthy.
Perfect world: (2023 ERAs as SP'ers)
+32 Giolito 4.88
+14 Pivetta (16>30) 4.66
+7 Houck (21>28) 5.01
+6 Crawford (23>29) 4.51
+3 Bello (28>31) 4.24
It's nearly impossible to use just 5 SP'ers over a season, so I know this won't happen, but this may show we can come close to the same sucky numbers our rotation put up, last year, or even better, assuming Gio snaps out of his funk, and nobody shits the bed in '24.
Who is the 6th starter?
Whitlock?
Winckowski?
Criswell?
Murphy/Walter/Fitts?
I think one key to winning more than expected is to limit the starts by anyone below those 5 SP'ers.