Bob's answer was to showcase the superior manueverability of the 53A, so that, having put aside that objection, the tactical advantage of the 53A in getting a lot more troops quickly into the LZ would win the argument. But it didn't happen, for a number of other reasons.
I'm not familiar with the history of CH-46 and CH-53 in the 60's, I know only that the Knight was prone to disintegrate mid flight, and there were severe casualties related to on board fires, when fired upon on approach to LZs. Could you tell me what were the other reasons for Stalion not to take over the role of USMC main troop transport at that time?