I'm not TGM A.I. but as my signature says i did stay at a holiday inn .
I don't think anyone does a complete zero shift swing because even those who come close like David, Ernie, even Freddie to an extent start on the hand only plane and then shift to the turned shoulder plane somewhere in the backswing.
I can't take the credit for my "mechanics translated into feel" because Brian is the one who taught me this "feel." I am just reiterating it .
The "feel" for me that allows that club to "drop" is a my hips sliding towards the target and beginning to turn. This allows the club to "drop" back down the plane.
Hopefully that helps
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I'm not a TGM or PGA certified Pro, but I did stay at a Holiday Inn Express last night