Lets get this straight...

Rinoa is NOT Ultimecia, Square has said ( this is a fact ) that sorcerresses live normal lifespans. Ultimecia lives " many generations in the future ". If anybody is confused about what a "generation" is, it is the average span of time between the birth of parents and that of their chilren. Roughly 25 to 45 years, many generations probably meaning like 250 years in the future ( at least ). Rinoa cannot possibly live that long...Riona obviously cannot be her.

Jenova is NOT Ultimecia, Jenova is more like a retarted mass of limbs and such, she looks nothing like her. Nanaki at the end of FF7 runs and sees Midgar, hundreds of years after the events of FF7. Midgar is still there. Why isnt it seen in FF8? Because FF7 and FF8 are not connected. And if they were, Jenova could not have survived the hundreds of years after the events of FF7. In FF7, Jenova does not talk, she is a monster not a actual person. So how did this monstrosity make the jump from retarted mass of limbs to tyrannical queen of compressed time? She didnt, because the games arent related.

Squall is NOT Griever, he was created on the spot by Ultimecia by taking Squall's thoughts and transforming them into the beast you fight. If the R=U theory has been proven false ( which it has been "see up above" ), then obviously so is this one. Squall could not have lived hundreds of years in the future, he is human and has a normal life span. Thus, Squall cannot possibly be Griever.

The evidence given by Square is irrefutable ( they have the last word on the subject ). R=U and S=G simply is not possible. You cannot say that there is still evidence unless you dont believe Square ( and that makes you a fool ). The J=U is simply ridiculous, for this to be true means all the FFs must be related. But they arent. All the FF are seperate games. The music, magic, creatures, etc. are there to help continue the traditions and quality of one of the best game series ever made.

These theories CANNOT be true, Square has confirmed it, so drop it.