Is that the lower half move that J Stone is showing? or is this 'launch' of the swing? in this gif, the obliques contracting pull the shoulder down, closing the gap as you say. Is this even the same thing as J Stone is showing?
This is the launch of the swing.. Doesn't look like JStone is describing this movement with his forced turning of the middle of his body. There is a turning element that occurs while getting into the leveraged position based on the pitch (think inside pitch).
Also these movements need to be reactions to actions up-front.. These reactions vs forced actions allows for the dynamic flow into becoming leveraged fyb.
Examples of UFA's
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