Well... Kenpachi did fight Tousen deaf dumb and blind... it's hard to say what'll happen. If Byakuya does win I think he won't be leaving with more than 1% of his life force remaining. You know if Kenpachi starts fighting with 2 arms I don't think Byakuya can really block that stuff, no one can. Besides, the force and speed of each of his swings in corrected manner is probably enough to catch Byakuya off guard due to the enormous area of effect it causes.
That said, Byakuya is as shrewd as they come and a bit of a wild card carrier, never really know what's up with that guy since he's always so calm. I hate to suggest something of an ending if it becomes reality but, maybe even stronger captains like Ukitake or Shunsui will show up and disperse the fight. God forbid Yama himself in all the fire of anger threatening to incinerate Byakuya.... Byakuya better not push his luck. Fighting the devil himself is already pretty bad, trying to survive the Sun... that's another story. On the other hand, even if Byakuya had this all planned out and is actually not revolting (as most people suggest), I don't think Byakuya minds killing Kenpachi, so if no intervention gets in the way we'll see something amazing. Seems like most in SS see him as a loose cannon that does more harm than good
