Well, I personally don't believe in the theory, but I'm glad that this site makes better arguments than the first popular R=U site *shudders at the memory* Anyway, I think that you people need to calm down a little.

First thing I would like to say: Ultimecia has wings. Rinoa has wings. No. Rinoa's limit break involves her getting wings from her influx of killing adrenaline (or however you want to word "limit break") and she has wings on the back of shirt, but Rinoa Heartilly doesn't have wings. Do you see her flying around everywhere in FF8? No.

Second: It mentions somewhere in the game (sometime whilst talking to Edea; when I get the quote I'll post it) that there are other sorceress' in their time, the game only happens to focus on four of them, and that they usually hide their powers.

Third: Griever's name, although it is the name of Squall's ring, doesn't mean a lot. What if there was a GF hidden inside of it, much like Doomtrain's ring, and they discovered a GF and named it Griever because of the name of Squall's ring? If Rinoa can remember a little detail like the ring's name throughout time, then I think even a GF could remain for many years into the future.

But personally, the main reason why I think that R = U isn't true, is the fact that people are trying to find something that isn't there. In the words of Freud: sometimes a cigar is just a cigar.