User blog comment:Godisme/Eliminate From Heaven/@comment-6342763-20130220215411/@comment-5745799-20130221213928

Perhaps, but Byakuya was in that same flashback. Actually, it wasn't even a flashback. By "friends", I'm pretty sure that she meant that Renji is just an ally that Kenpachi could possibly fight (assuming, of course, that Renji could possibly challenge him. I'd actually kinda like to see that.) if he was bored.