For the most part, he did do well, in the very few IP he had after 2019, but he was not really all that close to vintage Sale.
2017-2018
2.56 ERA/2.25 FIP/0.92 WHIP/7.1 K/BB
2014-2018, including time w CWS
2.85/2.69/0.99/11.6
2019 (147 IP)
4.40/3.39/1.09/5.9
2020-2023 (151 IP over 4 seasons: 38 per season AVG)
3.93/3.72/1.19/4.3 (2.6 bWAR/3.1 fWAR)
All these numbers are significantly lower than pre-2019, and all but the ERA is worse than 2019.
38 IP per season over 4 seasons (less than 60 over the last 5 seasons.)
Nobody expected close to this:
2.98/2.33/0.94/7.6
At best we might have hoped he could give us the 3.39 FIP from 2023 over more innings, which of course, would have been a big help, especially in light or what happened to Gio & Whitlock.
Of course we all wish we had the 2024 Sale on our staff, right now, but nobody expected this Sale. I'm not sure many expected the 2013 Sale over 170+ IP, either.
Many of us did not expect great or even good things from Gio, but we did reasonably expect 160+ IP. Grissom's future was mostly speculative, but he did have a decent OPS after 230+ PAs.
No doubt, the trade looks about as bad as anyone could have ever imagined, so far.