One thing that occurs to me: Didn't Hogan down-arch pretty severely coming into impact? So, although his left wrist is still flat past impact, it is nonetheless in the process of bending from a pretty severe bow.
So, the fact that his wrist is flat doesn't debunk the argument that the left wrist can/should be bending through impact or shortly thereafter, and the right wrist straightening. Hogan's position simply looks different than Wild Bill's, for example, because of where he started.
This make any sense to anyone else?
If your left wrist is still flat after impact,how can it be in the process of bending through impact.It doesn't make sense.
Does Hogan's left wrist stay flat to the end of his backswing?Of course not.It bends a bit later than Wild Bill's and in golf terms that little bit is a heck of a lot.
The illusion that Hogan's and other players left wrist breaking down and bending is due to the clubhead passing the hands so that the left arm and club no longer forms a straight line.I have said this before a long time ago that this can happen with a flat left wrist.A flat left wrist does not automaticallly imply handle dragging.Handle dragging is where the player stubbornly refuses to allow the clubhead to pass the hands even after impact.This is where TGM is flawed,not the flat left wrist.