Hmm... Jack, of course, has the advantage of having that special sword. Kenshin has the Hiten Mitsurugi style. I think if Jack was able to keep his cool, he'd be able to force a draw with Kenshin. It's hard for me to judge that kind of thing, really.
ah good point, but what if kenshin went back to his old ways when he killed and got that evil eyes again ?