No, he says something about the Fox guy running away, presumably towards the old guy since Kenpachi said he cried out his name before running. I know the two other captains are figthing the old dude, but Nanao-chan said that as they are, they don't even stand a chance. Besides, it's fair to assume that Kenpachi has a lot of combat skill, and doesn't just rely on his spirit power. I think the fact that pain, and incredible wounds don't phase him could also pose a problem to anyone who fights him aswell. As he is, he probably couldn't beat the old dude, but I think he'd be at least a good match. Also, I want him to find out his soul slayers name damn it! Then he'd kick everyones ass.