The spine could be parallel to the yellow line. The yellow line is nearly parallel to the upper red line anyway, and these lines are not meant to be exact representations of body anatomy, but merely illustrative of the reverse-K end-backswing position.
Jeff.
Maybe . . . it looks like that the upper spine has moved somewhat LEFT of its original position much like the post that you put up with the right butt cheek moving BEHIND the player??? Hogan has not created a lot of proverbial "pie."