Ok.
In a standard ORTHODOX backswing, the golfer starts on either the elbow plane or the hands only plane, and shifts up to the turned shoulder plane by the end of the backswing.
The
end of the backswing.
Parallel or longer.
You dig?
Just as Anthony Kim isn't "on" the Turned Shoulder Plane when he completes his backswing, Hogan—who loved to make short swings and hit all sort of less than full shots—often isn't "on" the TSP at the completion of his backswing either.
Because...
Hogan and Kim hadn't got to the end yet.
They made abbreviated backswings.
Comprende?
BTW, Good post Future.