We have major differences in understanding this topic.
I have addressed many of your issues in my post to Dariusz.
I am only going to comment on this statement that you made in your last post.
""In the backswing, he took his clubshaft up the clubshaft plane (not sweetspot plane 2)"
OK, there is a plane shift from backswing to the downswing probably exaggerated by the parallax effect. Yodasluke is not a robot. Or is he? His swing is the most precised I have observe of any human. The backswing stage is of low energy and it does not matter much that you need to keep the sweetspot on plane during a backswing. But he sure keeps the sweetspot on plane during the downswing."
Homer's definition of "on-plane" refers to the end of the clusbhaft and not sweetspot. See last paragraph of 2-F. Normally the sweetspot can be used as being equivalent to the end of the clubshaft - because it is roughly equivalent to the end of the clubshaft when the clubhead width is <4", but it will not work if the clubhead width is 18" and the hosel-to-sweetspot distance is 9". If one directs PP#3 (which you believe senses the COG of the clubhead) towards the base of the sweetspot plane at the start of the downswing when using a clubhead width of 18" (like Yodas Luke's big club) then it will result in an looped downswing action - as described in a recent post.
You wrote-" "The backswing stage is of low energy and it does not matter much that you need to keep the sweetspot on plane during a backswing."
My understanding of the sweetspot being "on plane" during the backswing (between the first parallel and the top of the backswing) is that it must be on the same plane as the back of the flat left wrist/hand. Yodas Luke successfully achieved that goal during his backswing by rotating the sweespot from sweetplane 2 to the elbow plane during his backswing.
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