If I'm not wrong the FFVI's story was Nomura who created.
He just worked as a Graphic Director for FF VI. For FF VII he did work on the story, but beyond that the only FF he's doing the story for is Versus XIII. He worked as the Creative Producer for Crisis Core and Type-0, so he can recommend changes/additions and help the director with the script but it wasn't him who did the stories in the end. He doesn't have as much pull when it comes to a lot of FF's stories like people think. Especially those who think he single-handedly ruined them. Lol.