Talk:The Outsider/@comment-60.241.36.221-20121229153255/@comment-3410662-20130104035741

Probably. But until we have a statement from either Bethesda or Arkane one way or the other, you cannot prove definitively that he isn't. After all, there are no shortage of games with aether planes that touch on multiple universes.

That said, he's almost certainly not Sithis.