Alright,
This proofs nothing because you don´t know if Edea is Ultimecia or not.
And even if they weren´t sorceresses now they had the right to become one by genealogy.
The thruth: Sorceress=Propagators from outer space who ruled over Centra after geting powers from an ancestor.There is only four generation on the dinasty.
The hoax:Any person can become a sorceress by receiving the powers of another.This happens indefinitely.
Let me tell you a little about FF8´s history:
Esthar was a country ruled by the evil Adel.
Sorceresses had been researched by Esthars scientists.
They were a closed country until they finally went to the "outside world".
Since they had a "sedentary" nature it was easy to deceive them into thinking that they were yet on the present.
They didn´t realized that the world was a WOTC world.
So they started to make research on sorceresses on the outside world and wrongly concluded the hoax.
This hoax was taught over the world and there you have.
Of course not.People loosed memory and don´t remember the events prior to the creation of WOTC (which happened on a different event universe).
I already explained my theories on the last two which can´t be really disproofed.
No one knows due to the reasons I already stated.
Nor the people from the Winhill Civilization nor the people from the Centra civilization.
Only Hyne which comes from the Winhill Civilization knows.
The entire Adel resistance members also knows about this (It was first discovered by Laguna,Kyros and Ward after they freed Elle and before they concealed Adel).
Hyne knows there were more sorceresses on FF8 than Rinoa at that time.
He just happened to get Ulti inside Rinoa.
What a coincidence that Hyne choosed exactly the person Laguna and Odine choosed isn´t it?
Not necessarily.
Grandpa at Balamb-"He could even be watching you now" Ah,Ah,Ah,Ah,Ah,Ah
Don´t forget Edea uses Cid as a pawn to control Garden.And Edea is possessed by Hyne.