Looking at some of Keuchel’s Statcast data and other advanced metrics, it’s very clear the dude is going to regress hard next year. He should still be a solid starter and will likely outperform what projection systems expect out of him given the strength of our infield defense, but a sub 3.00 ERA is incredibly unlikely to happen next year.
As such, I think I’ve convinced myself we need to add Musgrove to the mix. I’m still very high on Cease and am hopeful that with some grip / mechanical changes he can reduce the cutting effect of his 4 seamer and improve his command of the pitch, which will be critical for him to ever make the leap to TOR starter. However, until that actually happens he can’t be relied on to be more than a #5 type. With Kopech on a strict innings limit and not having pitched in two years, he can’t be counted on to be anything more than a partial back-end contributor next year. Given the fact these two arms are still works in process, adding a reliable #4 starter is an absolute must for us. And if we can add one who has #3 starter upside like Musgrove, all the better as it may help prevent against worse than expected fall-off from Dallas next year.
Joe Musgrove had a very promising 2020 season, finishing with a xwOBA in the 81th percentile and pitching at what was effectively a 4 fWAR pace. Looking at his Statcast data, two things stand out as potential drivers for what was a YoY gain in performance. First & foremost, he started using his breaking balls (slider & curve) much more at the expense of his 4 seamer & cutter, which is what most damage against him was on. In 2018 he used his curve & slider a combined ~21%, in 2019 it was a combined ~32%, and finally in 2020 it was a combined ~44%. More interesting, he experienced sizable spikes in the spin rates on both of these pitches last year, which just so happens to correspond with the whiff rates on these pitches from sitting around 40% in 2019 to 50%+ in 2020. In aggregate, these changes led to a whiff rate of 33% in 2020, which reflects an 8.3 point improvement vs. 2019. That’s absolute insanity and makes him a completely different pitcher if sustainable.
Now, therein lies the crux of the problem. Did Musgrove & the Pirates push for changes to his pitch usage and other things that could have improved the spin rates on his breaking balls? I obviously have no idea and given this is an eight game sample we’re looking at, it’s not a slam dunk that this version of Musgrove is sustainable over a 32 start season. That being said, for the right price, I’m willing to find out. If the Pirates are willing to accept a package along the lines of Thompson, Adolfo, & Beard (for all I know that may be way too light) I think I’d go ahead and pull the trigger. At worst he should be a solid #4 type, but the potential is there for him to leap frog Keuchel and become our #3 starter, which come October could be the difference between winning and losing a playoff series.