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Being as Paxton is basically a two-pitch guy, and given his finished mechanics, and given that he's already 'back' to the mid-90's ... what's to stop him from moving as fast as Lincecum, Weaver, and Verlander?
To me, as soon as he can hit both sides of the plate with his FB, he might as well learn to set up hitters (if he has to at all) in the big leagues. As Lincecum did.