There is a combination of rotary and vertical movent of the shoulders in the DS, Joe Norwood talked alot about the shoulders acting as pistons driving the arms through impact...ie. vertical not rotary...Norwood may have helped Hogan in the 40s.
If accumulator 4 has started to release...ie left arm is moving down and off the chest... can pivot motion do anything more than divert the path of the arm after release has started? ie. the chest rotation can't push the arm once the arm has left the chest....but the shoulders can move and alter the left arm in a different manner...?maybe redirecting the power package or actually adding force??
Maybe MFT swing starts with rotation and then fires later with vertical...but it is all blended through a general application of force....force is the ultimate result however it is achieved...aligned force.
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