Roxas. Roxas. He has the same name as the guy in his dream. That can't be coincidence.

Sora repeats it, quietly, "Roxas..." He's looking down at the picture again for a moment, recalling more of the dream he'd had, but then Roxas apparently remembers him from his band. He looks back up, and smiles genuinely at the compliments. "Yeah, I'm with Flashstep. We all do the singing really, though I did kinda take the majority of the vocals at our last performance, at the charity concert. Uh, it's nice to meet you, by the way... Roxas..."

And again, when he says his name, he's back to sounding and looking contemplative. There's clearly more going on than he's saying right now.