[O.B.Left]

A little thinking will show that the only part of the club that can be on plane in the Impact Interval is the Sweetspot, while the shaft is below the plane.

Your examples are the opposite of what you think. Hogan is pulling from release all the way to his anatomical limit at the finish, while Donald is throwing the arms/club through Impact with his Right Shoulder.

It depends how you define THE plane. I see most guys planing the Right Forearm and Shaft at Impact. Well , Homer did allow for a clubhead or sweetspot only deal too, but ... ah crap. Geometry in words sucks the big one.