If Estrada was throwing 3mph faster it doesn't really mean he'd be much more effective. All he cares about is his league leading 11mph drop in velocity between his FB & CH while commanding his pitches. Hell he could probably reach back and throw 2-3mph faster but that probably wouldn't help what he's trying to achieve on the mound which is miss bats by messing up their timing. If you throw heat (like 96++), you can get away with a little less command and at that point yea there'd be a difference between Osuna's heat and Chapmans but a guy throwing 88 vs 91 is not going to make it harder for an MLB hitter to square up your pitch, it's how you command it and maybe more importantly, how you set up that pitch.