[whip]

If that were true, you could just uncock at the very top and wait for the constant maximum speed clubhead to get to the ball.

no that would just mean the velocity would be less, the sooner you uncock the less velocity per the endless belt. It doesnt change that the given clubhead speed is maintained however early or late it's released. so to me this would say that it it would make a miniscule difference based on the loft of the face and the distance it achieves because of it, like what ob says