"After being told to wash his hands, his spin rates dropped."
So, he complied and washed his hands? 🙂
I think the Tweet with the pitch types and spin rates is also a little misleading. Identifying what comes out of a pitcher's hand and labeling it something without knowing the actual intent of the pitcher. Can be an imperfect science.
For German today, I think the variation in his fastball spin, before and after the ump thing, could be chalked up to normal variation. Only 32rpm difference (according to the Tweet). The changeup is not a rpm pitch, so scratch that one off. Then you have the sinker, which according to the Baseball savant game page, German only threw two sinkers in the first 3 innings, both in the 2nd inning, one at 2505 and the other at 2552 rpm. The average of 2505 and 2552 is not 2608. So the Tweet is for sure wrong on that. That leaves the curve ball.
However, the curve is also the pitch you want that good grip and those numbers appear high with a big difference before and after. So someone who really wanted to do a deeper dive on this would want to first recheck all that data in the Tweet, look at German's history, and look at individual curves thrown in the game today, and so on. The curve with the highest spin rate was in the first inning to Buxton, and the pitch plotting shows it was a wildly thrown pitch way in the dirt out in the left hand batter's box. I didn't see it. Then I wonder if there are some data capturing issues on those outlier pitches?
Fun story for sure!