"That's why I said 'one of you'." It's okay, Chikusa. But he frowns slightly. It's not his actual name? ... Should he ask?

... No. If Chikusa is hiding his real name, it's for a reason. He knows that in some ways he's attached to the name 'Specter' more than his actual name. So he just nods "I can imagine that kind of life would have you moving around a lot and needing to change your name..."