Went back and watched the Hogan slow mo clip again after John's post. What really struck me was how Hogan seemed (at least when demoing in slow motion) to get the hips to a slightly open position very early in the downswing and then just stop them there. The club seems to come from well above parallel with seemingly stationary hips.
Now I can relate this to momentum tranfer, but you always hear 'keep the pivot moving'', 'maintain pivot lag' and so on. For example Tomasello says once the hands get below shoulder height the left hip must keep moving - this seems almost diametrically opposed to Hogan's demo.
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