Quote Originally Posted by Stranger
but when edea temporily jions your party her weapon is SORCERY, how could she use socery if she wasn't a sorceress
The point of that was more than likely to keep the player from knowing that she had lost her powers until later on. Despite what the status screen says concerning Edea's weapon, we're told flat out later on that she had given up her powers without knowing it and that they had gone to Rinoa:

Zell
"S'up Squall!!!"
"So glad you're safe!"
"I hate to tell you this now, but we've got major problems down here."
"Well, here it goes!"
"Some big thing called Lunatic Pandora came out of nowhere."
"Matron couldn't achieve what she set out to do because of it. Which is ok."
"Matron's not a sorceress anymore."
"Matron gave away her power to someone without realizing it."

Squall
(To Rinoa......)
In any event, the Para-Magic utilized by those in Garden is intended to simulate the Sorceress Power, anyway. Sorcery is defined as utilizing spirits to make things happen. Guardian Forces are utilized to use Magicks. All of the characters that are using Magic are practicing Sorcery.