I will find out where they talk about Kenpachi's Soul Slayer tomarrow. I am almost positive that it is mentioned during the fight with Ichigo. We will see about that bankai for rukia also. Remember how baldy lost to Ichigo? Yeah. I agree that it is kind of whacky that Rukia would lose that that hollow in the beginning of it all also but MANGA SPOILERS! (SPOILER)Isn't it also equally retarded that his family including his dad...the Shinigami, got beat up by that weak hollow also?