"Not very much, no. They too, seem to have swords. As fate would have it, they seem remarkably similar to Zanpakutou. I would not be particularly surprised if they exhibited much of the same properties.
So. Suppose their intention in this is genuine. That, for all intents and purposes, they seek nothing more than to find their place. What happens then? Realistically speaking, they propose that we both fill the same niche in the wheel.
Do you see Shinigami and Arrancar sharing that space, willingly, and without conflict?"