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To elaborate, Velocity is a portion of Stuff. You seem to be arguing that Stuff and Velocity should be the same thing? I guess my response to that is why would you even need both ratings in that case?
The difference is that Stuff factors in the quality of all of the pitches. Fastballs (as well as some other pitches) get a better rating based on high velocity. But throwing hard does not having anything to do with having a good curveball. Stuff factors in that curveball and everything else the guy throws into one base rating that is meant to tell you how well they are at striking guys out.
IMO, the disconnect is likely that the Movement rating is poorly named. It has nothing to do with, say, how well a curveball drops. Instead, it should be named something like "Command" or "Precision". It is essentially measuring how well a pitcher can avoid making a major mistake that has a propensity to be sent over the wall by the batter. High K guys can also be High HR guys, so Movement is the HR rating.
Control is then the BB rating.
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