[ He seems to be having a one-sided conversation, but that doesn't particularly stop him, almost as if he doesn't require Sasuke's verbal confirmation. ]

If you spoke with him, and he said something along these lines... yes, but probably not quite, he has a bad habit of not giving full information. The only way to leave here is for someone to sacrifice their own self.

To link World with world, you require a bridge. To make that bridge, I require all my Keys. And when I have all the World Keys... well. ... Tell me. Who do you think is "most evil"? That is what will be asked.