Well one thing to be clear on, the game states that people only forgot the faces of the people who fought in the Battle of Carteneau, not specifically the people themselves. This is a complicated concept, but to put it simply as an example, lets say you had a long time friend before the Calamity, then you went off to the Battle of Carteneau and vanished into the time warp. Five years later go by and you suddenly reappear, more then likely your friend is going to remember you, probably be upset that you've been gone for the last five years without telling anyone where you were going, but won't remember you took part in the battle.
This is all speculation of course, but not everyone has forgotten about the returning members, Minfilia for example states she remembers who are you, and presumable others will as well. The whole amnesia thing (according to Yoshida) was not just a mechanic to allow for rewriting some of the story and integrating old characters, it's actually part of the story and tied to Bahamuts disappearance so we'll probably uncover the source and possibly ways to reverse it as we progress in the story.
This is all speculation of course, but not everyone has forgotten about the returning members, Minfilia for example states she remembers who are you, and presumable others will as well. The whole amnesia thing (according to Yoshida) was not just a mechanic to allow for rewriting some of the story and integrating old characters, it's actually part of the story and tied to Bahamuts disappearance so we'll probably uncover the source and possibly ways to reverse it as we progress in the story.
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