that's it buzzard boy . . . he submits that the hips turn AND MOVE LEFT during the back swing.
The drawings on page 75 of Five Lessons give this appearance.
In the face-on view, it appears that Hogan set up with a more pronounced angle to his right leg than the modern swingers who tend to set up with less angle and then allow the right/trail leg to move more toward vertical on the backswing.