The conceptually-mounted Shoulder Hinge Pin effectively moves into the Flat Left Wrist.
Accordingly, the Flat Left Wrist now duplicates the blade of a hinge moving perpendicularly to one of the Three Associated Planes: Horizontal, Angled, or Vertical.
I cannot imagine how I could put it more clearly, especially in the light of the afore-referenced videos, Parts I and II,
You probably have put it as clearly as humanly possible, but I'm a little slow on understanding the technical side of it. All I know is that to get the ball moving you have to swing the hands/clubhead and hit the ball in 3 different ways. The angle of the clubface - according to how the FLW is working will produce 3 types of shots (with the same power) - the short, high type (vertical) - the lower, longer one (horizontal) and the one in between (angled). If that works for me - I'll settle for that and let the theoretical understanding based on TGM live its own life (for the time being). The important thing is to get the shots (motions) done and the results one wants. Will that work...you think?