Plot Theories

[Christmas]

Implant is not the right word.
She uses her ability ONLY and they just remember their own REAL dream.
There is another possibility.A best one which joins Skyblade´s theory and mine´s.
Maybe they dreamed about their childhood and it activates the memories they already had.

So they remembered the memories.

You know,when a person has amnesia they don´t just remember everything immediately when someone tell them about it.
But a picture (or film) would do it better than words.

So in the end the person will recover his memories from amnesia which is a form of remembering.

Anyway,Irvine know about his age,his feelings and about the war because her ability not only let them see the past but it´s like they WERE THERE so they just experience the feeings and the thoughts.

Squall and CO also had the experience you spoke of when being transported to Laguna's dream world but they never remembered anything cause this is not their memories.They just knew about it.

So if they are transported to their own past and experience the past themselves with feelings and all this, it is as good as remembering it cause knowing it will never give the feelings and experience done by remembering itself.

From what I read, look more like they remembering it instead of knowing it now.

PS: And I apologize again for not reading the posts properly.