[Uh oh, logic isn't Aoi's strong point.] He wasn't in any of the photos of our class... [But then, neither was anyone to whom each photo had been given. It could have been another trick.]

But that could have been Monobear tricking us again! Two years of our memories were erased, so maybe what he's talking about happened before! [Yup that's gotta be it, no doubts!]