It is my present understanding that Homer meant in 10-13-C that the the shoulders could rotate on the same plane in the backswing and downswing if the waist bend was exactly right.
Here is a photo of Arnold Palmer who has a lot of waist bend and who rotates his shoulders on the same angle in the backswing and downswing.
Palmer has a steep shoulder turn (red line) in the backswing and that line points at the ball-target line. He then rotates his right shoulder down that same line in the downswing.
Hogan, by contrast, had a more flat shoulder turn in the backswing and a steeper shoulder turn in the downswing (10-13-A).
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