How big differences could the bijuu have personality wise? It's not like Bee's beast would be any boy scout, but somehow it doesn't seem as utterly evil as Kyuubi. Kyuubi doesn't seem just chaotic but somehow evil, after all. So, it's anybody's guess if it's possible to reach any sort of understanding with it, at least unless Naruto is himself ready to sacrifice something. And he's not exactly the first man around to abandon any principles as we have seen time after time. I think I have said it before, but that's precisely what I'd like to see: Naruto letting go of something to be able to use Kyuubi's power in a more controlled manner.