win via ko or death
fight at the seiretei
@othus12: I'm gonna say Kenpachi. Hitsugaya may have some tricks up his sleeve, but Zaraki has way more raw power, stamina, and durability. If he gets one good hit on Hitsugaya, it'll pretty much be in the bag which will most likely be before Hyoten Hyakkasso gets used. And even then...
Kenny wins. Toshiro's ultimate attack is that Ice Kush move but even when he does that, the opponent is still alive and they just slowly freeze to death. Kenny could probably break that attack purely with a reiatsu release.
Aizen said a battle between shinigami is a battle between reiatsu and I think it's true that if your reiatsu dwarfs your opponent their attacks are worthless and lose their magic effects. Some will argue Kyouka Suigetsu shenanigans negates all of what he said, but I think Ichigo breaking a god level black coffin with full incantation kido just by hitting it with a judo chop shows that there is some merit to reiatsu letting you tank and break high level attacks.