I agree that a golfer either shifts planes or he doesn't shift planes, and that there is no middle ground.
When I state that I have relaxed standards, it doesn't apply to the above statement. It applies to the accuracy of demonstrating a plane shift using still photographs from swing videos which are not free of camera angle distortion. The small degree of lifting up of the clubshaft above the clubshaft-at-address plane during the backswing in those still photos that I obtained from a swing video could be due to camera angle distortion, and may not represent a real plane shift.
I have never seen any swing video of MN that is free of camera angle distortion, so we may never be able to incontrovertibly determine whether he had a zero-plane shift swing, or not. However, there is a considerable amount of concordant evidence from multiple swing videos which suggest that he had a zero-plane shift swing.
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