Is it possible that a guy picks up a couple hundred RPM without a foreign substance? Bauer is perhaps the most visible because of his past statements, and a previous poster mentioned Gerrit Cole, but you have to look at Devin Williams and wonder if he is using something. I don't think his minor league performance could have predicted last year's success. His pitches do weird things, and he went from striking out 10-12 per 9 in the minors to striking out 17.7 per 9 in 2020. When Burnes went to the pitching lab, did he come out of it with an increased spin rate? It certainly seems that cracking down on the use of substances and getting a more "normal" spin rate would do more for increasing offense in MLB than any mound changes could ever hope to do. I'm not being naive, but maybe it's just that pitching is ahead of hitting. With emphasis on power arms, limiting pitch counts, and going deep into the bullpen every night, pitching has evolved to a place that is defeating hitting.