I mean, that's generally how it goes. You can't command the slider so you have to throw fastballs which are almost always 'straighter'. 9 HR on the fastball, 6 on the slider ( up from 3 in 2018) He got more whiffs with his fastball, more Ks, than 2018. Because he threw it more. his BB% on the slider was exactly the same, but his K% went from 56.4% to 35.9. PutAway% from 37.3% to 25.2%. He lost some vertical movement on the fastball too, about an inch, taking it from above average to slightly worse than average, which I guess is probably enough for that few feet of HR distance and the 4 mph EV. I'm not a pitching coach, so what's this all mean? Why was he getting so many less Ks on a slider that seemingly was the same? The issue seems to be one of location more than anything else. He just couldn't keep the slider DOWN. Lots more in the zone, especially down and away to lefties/in and down to righties. In 2018 he threw 3.85% slides in the center of the zone, and 10.57% in 2019. to Righties. He just couldn't get it down. This is starting to feel to me more mechanical than just ball composition (though that certainly made the problem go from "he's not that good", to "he's bad")