This could certainly use more reference support and detailed discussion...
Book reference, audio tape, quotes? The book seems to steer clear of it maybe.
Ted in the quote above mentions that in the audio tapes Homer revealed that Drag Loading , the Swingers Start Down was "advantageous" for both Hitting and Swinging.
I dont see how a strong pivot like say Arnie's could not be considered #4 power. Pulling. Left Arm. Maybe if the left arm was bent? I dunno.