He's an augmented clone of someone else is my guess.The also very strange comment that he is, "borrowing someone's face," and wondered if Suletta does too.
I struggle to see this happen, because if without Ariel she can't duel, and duelling is the only thing that lets her progress in this school. Given that Peil Technologies is also using GUND Format, they'll probably just stay hushed about Ariel.It would be a huge surprise if Suletta actually lost Aerial temporarily at the end of next episode