John,
You wrote regarding Hogan’s clubface-: “The more open, the more the body can rotate aggressively and close the clubface with pivot rotation.”
I totally disagree!
When we talk about an open clubface in Hogan’s mid-downswing where his lead wrist is still cupped, we are really talking about an open clubface relative to the clubhead path. Body rotation cannot possibly close the clubface relative to the clubhead path in the later downswing - although it can close the clubface relative to the ball-target line due its effect on the clubhead path.
Hogan closes his clubface relative to his clubhead path by using two biomechanical maneuvers.
First of all, he converts from having a cupped lead wrist in his mid-downswing to having a bowed lead wrist in the early phase of his late downswing - as seen in the following animated gif.
Then, he also closes the clubface relative to his clubhead path by supinating his lead forearm a lot in his later downswing.
Jeff.