It is still not clear to me, because you state that the swivel is an independent roll of the hands. Independent of what? From my perspective, I can envisage the release swivel involving a 90 degree rotation of the left hand (from the delivery position to the impact position), but it is not clear to me that part of the rotation doesn't occur at the level of the left shoulder socket and orbiting arm. Likewise, when hitting short pitch shots, I can utilize different hinging actions which are not due to the pivot motion (which may be minimal), but due to an independent controlled left arm rotation at the level of the left shoulder socket +/- a certain degree of forearm rotation.
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