[Yoda]

I'd say Venturi would agree with your 'cast' feel

Yes, I remember an article Ken did on the short game years ago where he put both wrists and forearms in casts. In addition to preventing any Left Wrist Bend, the Left Wrist/Forearm cast precluded the Wristcock. This would be another helpful image because you would rarely use the Wristcock -- the Velocity Accumulator (6-B-2) -- in a Single Barrel (10-4-A) Stroke.

Incidentally, I have previously commented on the mistaken notion that maintaining the 'Locked' and 'Frozen' alignments requires a tight Grip Pressure. It is helpful to realize that the 'cast' that 'freezes' the Right Wrist in its Bent and Level Impact Fix alignment does not prevent the Wrist within that cast from remaining in an inert, unstressed condition from the Top through Impact per 4-D-1. In other words, the cast is one thing and the degree of tension in the Wrist is quite another.