In my initial response to the question was that Fei's truama caused hiswhole life to change. The release of Id was brought about by the angerstored from the experiments and the death of his mother. This releasedhis inner power which also released the reason behind his power. Those memories included Emeralda This also happened to Elly at Jugend (therelease of power but not memories like Fei.) I guess something pulled Id toward Emeralda What it was I'm not sure except Miang had something to do with it.
The outcome was an explosive battle between Id, your party,and wiseman. So I guess that means that each reincarnation does alter the next life, because once Lacan had his contact with the Zohar Modifier the future generations need not have it ( the power was already there.) They just got to find a way to release it. So trauma can be a good thing. (For a video game).