Wow, is there any proof they're all part of one big story? Is there any solid proof of that? I think it's all speculation, though.

Probably one thing that hurts that theory the most is that FFIV has a (SPOILER)moon in it, but in FFVII when they (spoiler goes down more than one line) (SPOILER)show space in the Bahamut Zero summon as well as when you travel to Outer Space with Cid in Shinra 26, I don't remember seeing a moon. Meteor, yes. Moon? no.

If someone would like to debate me on this, please start a new thread.