I'm not discussing the theory itself here, but I will say that I consider Rinoa being left in space evidence for the theory more than against it. But that's another issue.

While I see your point, I don't think being a god/ servant of god qualifies you as good by a long way. I still think on a personal level Rinoa dieing by Squall's blade adds a lot to the story.

A full scale war would have been fun to watch though kinda pointless. At the time of hostilty in each country they were effectively being run by the same person.

I wouldn't say there is as much evidence as there is for as against. There is no evidence against it, apart from it isn't directly said. I do however consider the theory about 50/50 in likelyhood.