[golfbulldog]

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...

Why is there a stationary point between my shoulders?

Why do you interpret Homer's words as NOT stating that the right shoulder should turn on a single plane on the downswing?

He called the downstroke shoulder turn "on plane"....as in 10-13-C...really hard to interpret that as anything other than on plane...TSP as recommended in 12-1-0 and 12-2-0....