[Jeff]

GBD

You wrote-: ".but the shoulders can move and alter the left arm in a different manner...? maybe redirecting the power package or actually adding force??"

Let's presume that the right shoulder can add thrust force (push-pressure or added weight) to the right forearm/wrist/hand in the late downswing and at impact. Would it make the ball travel faster?

Not according to this collision review paper.

http://nmgolfscience.tripod.com/collisions.htm

Jeff.