Next, I'd like to point out the different accent means nothing. In the original Japanese there was no accent, that was just square's translators sucking, as always. As for the last part, again, I ask you to stop making things up. It's as if I'm reading fan fiction here.
Um, I guess you misunderstood me. Ulti spoke very aggressively, Rinoa wasn't like that. So the way how they talk is different.

Okay, your theory goes directly against what is stated in game. The game tells us that they lost their memories because of Junctioned GFs. We shouldn't question that to somethign that you just made up.
That's a lie, they just don't want students to worry. They have lied about some other things too. Go figure for yourself.