Power supply for hitting is 1,2 and 3. We have been emphasising pressure point #1 as major and pp #3 as sensing. Do anything need to be done, feel for pp#2?
Applying right arm thurst: pushing down to straighten the right arm instead of naturally rolling after impact (like snapping) feels unnatural. Is this suppose to be a natual move?
I only Hit for mid-irons down through wedge. I feel only the heel of the Right Hand driving the Left Thumb down through the ball. I have no awareness of the last three fingers of the Left Hand(#2 PP). Maybe some "real" Hitters have different thoughts.
I roll the right forearm as I thrust through Impact, which gives Horizontal Hinging. I do this to avoid the fade which results from Angled Hinging.
If you are intentionally rolling your forearm through impact you are moving away from the machine concept of the three dimensional impact; down, out, and through.....down and out....manipulating the roll is deadly. See 1-L 13 through 15. Any rolling action should come automatically from the pivot....
In the book, all pp related to its power accumulator. Therefore, even power 1, 2 and 3 are used for hitter, only PP1 is used directly for thursting, #3 for sensing and no major use on #2. That means, not necessary all pp will be used even the related power accumulator is used? Just try to clear the fog.
As Matt said, how else do you Hit with a Horizontal Hinge? There's no CF to do it, and turning through the ball doesn't change Angled Hinging to Horizontal Hinging. I suppose you could roll the Left Wrist intentionally as in a Hand Manipulated Swing, but why, when it's so easy and natural to do it with the Right Forearm?