Couldn't agree more. An on plane right shoulder in the downswing is not an option, it is mandatory for Acquired to Full motions.
The hardest part for me was allowing the right shoulder to play it's proper role while Swinging - but Chuck Evan's vids over at Medicus eventually cleared the fog for me.
What is the title of the video over there?
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If you cannot take the shoulder down the clubshaft plane, you must take along some other path and add compensations - now, instead of one motion to remember, you wind up with at least two!