I've seen enough video of Meyer that I can tell you this with absolute confidence: Meyer does not keep a consistent release point. When he drops his arm angle down, flat out sidearm, he's very hittable. Not much movement on his pitches. When he stays up top, his pitches have a lot more movement. Fixing mechanics isn't always an easy fix. On the other hand, Betances is a high octane, balls-to-the-walls pitcher. Max effort on every pitch. Hence the 135k's in 90 innings. His problem is all of the above. He burns out after, maybe, a couple innings. He can no longer control that big body and it gets really ugly. Simple fix: watch the pitch count. Oh yeah, when Betances tries to pump it up to 100mph, his delivery goes, nuts, too