To be honest being freed from possesion seams to be the most likley of the choice of them in my opinion even if you don't believe R=U. One member of this forum stated that Ultimecia may be possesed her self, and provided evidence by comparing Ultimecia's long speech to Edea's speech when she is saved. Who is possing, there could be a number of theories.
And then she casts "Devour" on the party!...Ok maybe not.
Works for me.
Do you Xplode the game too? I'm currently on my first real playthrough.