Why do you think Hogan's right hand was so on top of the club?
To me it is the top right knucle that he wanted to control, You can swing to hard and get over active with it from the top or you can get over active with it at the bottom. Hogan's left hand was not as weak as many might think but the right hand was. By moving the right knuckle on top coupled with his layed off lag he could go at it as hard as he wanted and was sure not to come over the top and get over active with the hand. As he pushed the club to the aiming point with the right wrist and right knucle the rotation of the dominant right side squared the arc and the right hand controled the shot.