>>282967533
One soul may be dominant over the rest, however gillians themselves seem to have lost a lot of their sense of self, only to recover it later on. It seems like it would be quite unusual among them to have any memories of their life as a human at that point. As far as the ones going to hell, it's possible the other souls get taken along with them, but it's also possible that they get expelled and return to the cycle of reincarnation. I don't recall the series going into a lot of detail on what exactly happens.