about the origin of ultimecia (big big spoiler)

[Future Esthar]

Unknowns,I was just referring to the information section of the tutorial.

Dear friends.Can´t you see that Ulti is Edea?
Was sorceress Adel even at Edea´s house?
If Ulti=Rinoa,Ulti would die when she kill´s Rinoa.
There is only Edea left.
And of the four sorceresses,Edea,Rinoa,Quistis and Selphie Edea is what is left (the others fight Ulti).
Edea don´t fight Ulti.So she is the only one who could be Ulti.
We can even see the White Seed and THEIR SHIP.
Yeah,you can see the White Seed Ship there.It was destroyed by Ulti but it is there.I can tell you where it is if you don´t find it.
Edea´s castle was on the past not the future.
Squall even remembers it (yeah,he remembers at least the location of the master room).