In the commentary they say that the conflicting lifestreams were going to make natural disasters happen on the planet, namely a large typhoon. Then a few minutes later they make a joke about having Gods and mythical creatures in the background in the original cut. They don't mention Ramuh or any other Final Fantasy summon, and as Hsu said it would be horribly out of place if they actually did do that. Anyway, I don't think the movie needs any help, I think it is an amazing film just the way it is.