Here's a hypothetical. Suppose Kerry's boat was under heavy fire and he gunned the engine, Rassman fell overboard, and there were no other boats present. The hypothetical is this: Would Kerry have gone back for him?
The better question is "Has Kerry ever given the same account more than once?"
Perhaps another would be "Have Kerry and Rassman ever given the same account?"
Kerry or his spokespeople have given several versions of every story they've tackled and there are plenty of stories for them yet to take on.
Kerry Kool-Aid: A different flavor with every sip.