I think, after reading it all, you may be right. Jean may be Laomedon, son of Tithonus, the one who persuaded Asterion into killing his father against the will of Zeus. Both of their fates may be sealed by this act, as Laomedon in the last tablet states he no longer belongs to any country and is searching for a redeemer himself, if not to become a redeemer.
Perhaps he thinks by Asterion demonstrating his hospitality for all he sends his way (as he did for Laomedon and his father originally) will help redeem him in the eyes of the Gods? It certainly seems to fit well with the guilty vibe I was getting for some reason.