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I think Myman's scap loading concept and the fact that the major underlying joint action associated with it is pinching the shoulder blade toward the spine in the back shoulder is more in the realm of an inportant universal detail that explains what Ferroli and Epstein and others have understood at a less exact and detailed level.
In throwing it plays a central role.Even Fleisig at ASMI has started describing the key association between this and velocity potential as degree of horizontal adduction.Before he had touse the more vague shoulder moption terms.
With regard to hitting,if you understand scap loading and horizontal adduction's role in it,you can make a distinction between centering the bat vs wrapping.Centering is a successful way of loading the upper body without lengthening and may even shorten the swing.At Epstein's level of detail,he just has to say centering and wrapping are bad and are survived only if the player has the natural resources to do extraneous stuff without degrading timing.
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