LAball - I am guessing we are going to have to agree to disagree on this one. I just don't see any actual increase in momentum or power derived from a full wind up versus a properly executed delivery from the stretch. Your premise is that the pitchers who do not suffer drops in velocity are doing so because they exert more energy, than they would have from the wind up.....I don't see that at all, not in the case of the pitchers from MLB I described, nor from my son. Once they begin moving to the plate, nothing they did before that provided any more momentum, torque, or arm whip.....I just don't see how it can, and I have not read anywhere actual reasons why it would, other than "it just does". I've timed pitchers from both positions, and once they begin moving towards the plate, they land virtually at the same time.
Good debate nonetheless.