Absolutely did not know that. Not that I’ve ever spent a lot of time looking at pitch type release points.

As far as this part:

Instead of jumping immediately to speed, release point and spin movement for explanations simply because they are the numbers listed on Fangraphs, try looking at the pitcher’s results—balls in play, swinging strikes, called strikes, fouls and called balls—and working backward from there. Is the pitcher performing better because of better results on balls in play? Why? Look at his ball-in-play charts and see what you can learn.

I would actually think that’s intuitive. Seems to me the process should always be looking at changes and then working deeper and deeper to try and figure out what (if anything) is actually causing those changes. With all things, not just PITCHf/x. I really hope something like that doesn’t need to be said, but maybe it does.

The rest of it certainly does. Very helpful.

I have a response for several of his points, probably for next week.