I think one of the first things yoru said implied that they can come back. I don’t think it’s a spoiler because this was way back. I had a theory that it doesn’t have to devour devils completely but the recent chapters have sort of thrown that up in the air. She says nuclear weapons here, not the nuclear devil, so I had a theory that the nuclear devil was just part of the bomb devil. Mostly because a wwii devil is stupid, and it must be a part of the war devil, then I jumped off from there.