Hmmmmm.....
Yup. Edea looks younger because of the style change... Must've been hard to use hands with those claw thingies... Didn't her style look similar to the ones before and now after...? In other words, maybe when she was possessed, Ultimecia didn't like how Edea looked, so she went and got all those fancy dresses and stuff.

I don't know about the R=U theory. I don't exactly think about it too much.