Yes. And pitchers with repeatable mechanics are typically the strongest and/or most consistent.
So, I'm not talking about cats who wildly alter their arm-slots, ie dropping down side-arm.
I guess I failed to phrase what I want to express adequately, KVNNN
See- That's what I never kenned: It has always appeared TO ME that some pitchers vary their delivery between the top of their arc through their delivery. The arm action looks different to me and not simply the grips.
All these years as I have tracked the ball in the hand have I simply imagined course deviation or does the angle change during the follow through?