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Not really knowing anything about the subtleties of pitching mechanics, other than what looks "normal", the locked front leg syndrome is very noticeable to me. It's just jarring, and seems as though the pitcher is stopping needlessly short. It seems like you would gain so much more control and leverage by following through naturally. It also seems like it puts much more stress on your arm, as once you lock that leg, you're putting all of the work on the arm to catch up with the rest of your momentum.
Like I said, I don't know the first thing about proper mechanics, but Aumont and Cortes seem like they've succeeded in spit of their delivery.