I just wanted to say one thing really fast since we are talking about a somewhat old J-RPG... is it at all possible that the She is a mistranslation...?
That said I think the game would of been better if Adel was the final boss and Ultimeca or w/e was just never made.
The whole "Im a witch from the Future! FEAR ME!" and the party looking at her still going "Who the @#%! are you?!" just didnt do it for me... i mean the first time you see and talk to her EVER is the final battle... yeaaaa... its still better then Necron I suppose...

I am a man who believes it takes a good villain to make a good game... Like Kefka great villain... that said I personally hate him cuz I dislike his char in general... he is a great villain, Golbez another good one... screw Zemus... And Seifer is a good enemy, villain no enemy yes.

Thats what I believe and I think it might be a mistranslation since in French they say "He" and "She" talking about Adel so who knows right?