I am glad you enjoyed these past few months as a 'lurking' guest. Welcome aboard as a bonafide member, and thank you for your first post!
To your question:
I advocate a Right Shoulder that moves back to the Inclined Plane (Turned Shoulder Plane / 10-13-B), not a Left Shoulder that moves down (toward wherever).
I advocate Hands that move from an Elbow Plane (10-6-A) to the Turned Shoulder Plane (Single Shift / 10-7-B), not Hands that move from a Hands Plane (10-6-E) to an Elbow Plane ("X" Classification).
Andy Plummer (Plumdog on this site) and Mike Bennett are friends that I meet on the practice tees of the PGA TOUR. I admire their work, but on these two points . . .
We definitely see things differently.
The beauty is that both procedures work.
A Q.
Isn´t Elbow plane 10-6-A and not an X?
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Golf is an impossible game with impossible tools - Winston Churchill