Xbox 360 vs PS3

He is talking about the main series, and the inevitable KH3 for PS3. 'cause there's no KH on Xbox.

That is the worst logic ever. Everything has to begin somewhere. Just because there's no history of it being on the XBox doesn't mean it can't/won't go to the XBox.

That said, it's much more likely that it will stay on the Playstation because of that history. The only parts of the series that have been handed to Nintendo have been the inconsequential ones.