I think I understand what you are saying about PLANE DRIFT. Some do seem to do as you describe.
An extreme example of this, I believe, would be the PLANE philosophy of Don Trahan, known as THE SWING SURGEON. He wants the butt of the club to point at the LINE YOUR TOES ARE ON, throughout the BACKSWING, and most of the DOWNSWING. His son, D.J. Trahan, on the P.G.A. Tour, does appear to do something like this.
He teaches a variation of a SWINGING PROCEDURE, and some of his students do very well. His technique is supposed to be easier on the back.
Have heard of the son but not the father.
What I am saying is that all players are on plane at address(plane angle usually hands or elbow), most good players are on a different plane angle at end ( TSP or squared shoulder) therefore there has been a plane angle variation.
I know TGM says that ideally club remains on plane even during shift but i basically wonder how many really do achieve this on the backstroke... i think some get very close, most will be less precise.
I used the term "drift" to describe those that meander off plane during most of backswing ( these would be all club-pointing-at-toe-line people etc). I do not mean to suggest that ,as far as TGM swing ideal is concerned, "shift" is wrong.
Just that most swings go off plane sometimes in backstroke and still get on a plane angle at top/end. The left arm horizontal (artificial as it is and I take all Martee and Matthew's points on board) catches most people "mid drift" or as they say "off plane - double shift x classification).
Not making too much out of it, just putting out thoughts...
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