Iacas, you said....... "Roy, the simple fact of the matter is that in every golf swing, the clubface does not stay square to the plane past about the position where the shaft is horizontal to the ground on the backswing. In every golf swing (and by that I mean everybody's full golf swing, not any swing ever made), the clubface will rotate to a position that's about 90 degrees from "square to the plane."
Just a couple of points Roy mentioned he was using a very strong 4 knuckle grip and that reminded me of the Jerry Heard "super swing". Occasionally I'll have a few swings like this at the range.
Interesting grip.......super strong top hand with the thumb running down the back of the shaft so it would feel like the hammer and nail analogy that Roy was trying to pass on.
Bottom hand....also with the thumb running down the back of the shaft and the knuckles pointing towards the target.
So when you pick up the club the and swing up to the top, the clubface can stay square to the target.
It's an interesting swing method with alot of power, the only downside is you must keep the bottom hand thumb travelling down the line and not rolling over.
Also Jack Kuykendalls "E2E " swing is a swing with no wrist cock and a square to the line clubhead.
Maybe Roy was referring to something like Heards grip and swing.