It wouldn't be permanent. Just for the truce negotiation. Technically you'd still be a part of whichever side you chose, but it'd leave you free to talk to both sides, so there's communication. Like, I'd mediate between Agito and Kaito, but wouldn't really be for one side or the other. But in the end, I'd be more on Agito's side, since I'm always with him.
It doesn't really leave you alone...just more as part of both sides. Kinda neutral. Does that make sense? [He's not sure he's wording it very well]