[Mathew]

Once loaded the right shoulder is better off staying on plane throughout the downswing...no? Maybe not always on the same plane as the pp3 at impact..ie. the shoulder does not have to be on the same elbow plane as pp3might be using at impact....but it can still be on plane....ie tracing??

So what I think your saying is that you believe the right shoulder can stay on a singular plane throughout the downstroke.

Ok think of it this way - you have a stationary point fixed in space and lets just for the sake of simplicity take that as the point between the shoulders. For any specific plane angle this stationary point is going to be a set distance above the plane. Now each shoulder is a set distance apart from this stationary point. If the right shoulder is on one specific plane angle then the left shoulder is going to be moving parallel and twice the height above the plane as the distance that the right shoulder and the stationary point.

Now an exercise - Visualise this and tell me whats wrong with the idea...