[He's thankful that she's not digging too deep into it for now, because it is still painful. He'll probably say more if needed, but only if really needed, because he'd rather not go into his own failings with Xehanort and his students.]

I truly hope so, too. But with what I've learned, and knowing his wants, it wouldn't surprise me at all if he was behind this again.

That is different from the first Keyhole that appeared...although defeating a large Nightmare does seem to be a part of it.

[That's something he hadn't thought of.] Do you think perhaps a different world might have opened up if someone different had shown up by the Keyhole?