A few names? 'Logan' isn't one he's seen on the network, but most seem to have opted for some form of alias, and a man with multiple names probably would as well.

"Myself, I only have the one. Sephiroth." He takes some pride in that; you sort of have to, with a name like that. "As for theories, however... Without more data, they're mostly guesses. Or perhaps simply paranoia."