[okie]

Trevino's "dip" is instructive. Why not start your head at the impact postion? We "bob" largely because the ball is waaaay DOWN there! I'm not sure what you are asking about hinging. Trevino used #1Acc actively which naturally produces an angled hinge. The right shoulder is part of both the pivot as well as the power package...and therefore has more to do with clubhead matters.