I think that the amount of axis tilt depends on one's pivot action style.
Badds is now a S&T golfer which means that he positions his head in the center of his stance. He then keeps his head stationary for the remainder of the swing. Under those conditions, he cannot develop a greater degree of spinal tilt - unless he shifted the outer border of the left pelvis outside the outer border of his left foot (which is not a good idea). Therefore, I think that his degree of axis tilt is appropriate for his swing style.
Hogan positioned his head right-of-center of his stance at address, and therefore he will acquire a greater degree of axis tilt in his downswing.
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