In the end it comes down to how well they keep the speed going through the exchange zone. I mean look at the Jamaican women they set a national record (faster than Beijing where they won gold) at this years world champs and finished 2nd and no one can say that on an individual basis that individually the Jamaican women were anywhere near their beijing shape.
So it could be argued that they had much cleaner changes and kept the batton moving smoother around the 400m at this years world champs to get their National Record. So couldn’t a slower (man for man) mens USA team collectively match the Jamaican men if they have smoother and faster exchanges.
That being said…how good would it be seeing Bolt and Gay recieving the batton together…it would be on then!!!