Quote Originally Posted by Big D View Post
The theory was put forward by one of the writers (not Tetsuya Nomura, but someone else) at an interview or press conference. He stated it as a possible explanation for the strong links between X and VII.
And the theory open a plot-hole in the story of FFVII.
It's stated(in FFVII, or in the UOG, or in both of them) that Shinra begun as a Weapon Manufacturer company. That happened BEFORE they discovered about Mako and what it could do for them.
But Kitase said that Shinra's(of FFX-2) ancestors already knew about Mako when they came to Gaia, and created the Shinra company using the power of it.

Plot-hole.