Mathew - thanks for responding and offering a detailed explanation.
Unfortunately, I don't have the intellectual firepower to understand your explanation. I would need an even more simplified explanation, preferably with diagrams, to understand your viewpoint.
I especially don't understand your statement "to think of the 'perpendicular' (cocking and uncocking) displacement as taking place on a curved plane is incorrect unless your 'reinventing' what has been one of the most basic cornerstones of engineering and mathematical knowledge as has been practiced for the last few centuries."
When I state that the left wrist cocking/uncocking is occurring on a curved plane, I am referring to the sequential movement of the "left hand uncocking unit" in space over time. The left wrist has to uncock in a perpendicular plane (relative to the left arm), but if one traces the path of left wrist uncocking motions during the early/mid downswing, then the path is curved. To make my own position more understandable, I have produced this series of images.
I got these capture images from a Stuart Appleby swing video
I used a spline tool to trace the butt end of the club at the left hand to trace the movement of the
flat left wrist unit during the downswing. One can see that the sequential movement of the "left wrist uncocking unit" forms a curved path. One can also see that the curved left hand path intersects the inclined plane in image 5, at which time the back of the left hand is also parallel to the inclined plane and the clubshaft is on that plane - and that supports my previous post where I stated that the left wrist uncocking phenomenon occurs on a curved plane that only intersects the single inclined plane "somewhere" in the mid-downswing.
You stated-: "If the left wristcock takes place without a bent or arched condition, it moves on a plane that is aligned with the left arm. Since the left arm is not onplane and it is above plane therefore the left wristcock plane CANNOT EVER be aligned to the inclined plane."
I believe that image 5 disproves your theory. I believe that there is a
single moment in time when the flat left wrist uncocking plane is aligned to the inclined plane, and that occurs at that exact moment in time (depicted in image 5).
Jeff.