Originally Posted by Unrest
Nooooo... KH is definitely not FF. If not for any other reason, it's got a different name. It's got some characters mashed in, but it'd be like making a Mario RPG and then make a chapter about Donkey Kong in it because there was Smash Bros. or whatever it was called where the other guys appeared.
Edit: And Vagrant Story, however beloved, has hardly anything to do with FF system-wise except Ivalice.
This is an excellent point.