Um, you don't disprove a theory with no evidence Serepy.
You present a theory, you present that theories evidence. It's how it works. You're the one who needs to present facts first, not the other way around.
All arguments for this you have posted require everything else to be true, however none of these things have any kind of evidence supporting them.
Also, perhaps Rinoa is just a flirt? She see's a guy, becomes infatuated, and dances with him. She's also kinda dumb, and quickly falls in love.
Next, why is Squalls mind cutting to Ulti?
What are the two most important things going on right now? Ulti and Rinoa. So yes, both of them are likely the most prevelent things in his mind right now. He is told to think of friends and love, but Ulti is still appearing in his mind. Why is that?
Simple, he obviously has to try to focus on friends and love, but with something going on as it is, something like that would be hard. It's more likely the constant flashes between Ulti and Rinoa is Squall trying hard to shift his focus onto Rinoa, and that is the writers way of showing it.
Also, I pointed out the Symbolysm thing on Page 1. PAGE 1! I feel like I'm being ignored.