I'm not so sure. Using a Keyblade...that's something we can do. But being Nobodies--that's what we are. It's in us. Riku thinks SERO might even try to make more of us if it figures us out. If the Nobodies I used to command wouldn't listen to me after I quit, new ones definitely wouldn't.

[He looks back at Joe, not knowing how to show he's being sincere, but instinctively trying to do so anyway.]

I won't. But it's true that fighting them is pointless if people just come back anyway. If we end up having the same enemy--I wouldn't go help them just because we used to be in the same group. But if it was better for all of us, and would protect my friends, too? Maybe then. It would depend on the situation.