Quote Originally Posted by Roogle View Post
The fact that connects the world of Final Fantasy X with the world of Final Fantasy VII was only mentioned in the Final Fantasy X-2 Ultimania, so I believe that the connection only came up after the completion of both games rather than something planned from the start. I cannot say for sure.
some Square producers..Kitase and Nojima it would seem:

Final Fantasy VII - Wikipedia, the free encyclopedia

Al-bhed shinra from FFX-2 being the apparent link.

I never gave it much credence.