Originally Posted by shinangel2292
It all boils down to one thing really. In the final battle against ultimecia, if ultimecia was to kill Rinoa (as in my first attempt) she would have killed the past version of herself and destroyed her own existence in the process.
While R=U as a theory doesn't work, this actually isn't a strike against it. Time Compression (even though never fully completed) isn't subject to a concept like the grandfather paradox (or, here, something similar), because Time Compression doesn't necessarily follow the same rules as "normal time travel." Time Compression, as suggested in-game, involves compressing various states of present, and while the Magic is in effect, these states of present can "coexist" without creating causality and continuity paradoxes. Essentially, each "present" now exists without being dependent upon its own past; in overlapping, they are independent of one another for their own continuity.
Basically, as I see it, the states of present exist independent of each other for the purposes of Time Compression. Changing the past wouldn't alter the future, because these are meaningless categorizations within the framework of Time Compression. All time is one.
In any case, as already shown, Ultimecia created Griever by Drawing the parameters for the GF from Squall's mind ("Your feelings, I shall summon the most powerful of things [from them]!").
Originally Posted by Autumn Rain
Wait.. It's been awhile since I played FF8, but I don't recall Ultimecia having Squall's ring.
There's no evidence that she does. It's simply an assumption one is forced to make if one chooses to ignore Griever's having been created during the battle.