Compare Seve and JM. 10-14-B is a lot helthier than some other hip actions. We all know Seve has HUGE back problems. I'd guess JM has a healthier back. Not a trained eye, but I feel Seve is more or less crushing his lower back coming down. As he seems to clear his hips (slide forward) later and less.
(I may be totally wrong about this observation as regarding the actual reasons for Seves back problems, but it caught my eye).
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