I think... You already sort of saw what the problem was. What it still is, Roxas.

[ That he's still only a partial being. That ever time he feels like he is about to be close to obtaining what he wants, it gets yanked away from him. Then Vanitas gets swallowed up again.

He huffs. Then takes a deep breath. ]

They'll come whether or not I want to make them. They force their way out, you see. I haven't had to deal with it in a while.