Its possible? however, the "Child" tablet makes me think its unlikely, as asterious tells the adventurer that "he'd welcome him as a guest with open arms, if it were not for the weapons in the adventures hands". The tablet ends by saying "Perhaps a seasoned warrior would have left the adventurer to die, but a child wouldn't know that a beggar can hide a knife".
This indicated to me that asterious eventually invited him as a guest (in tablet 7- Ichor, asterious is show to guide them to the weapon, though the circumstances are unclear) and the "guest" did something terrible, incurring the wrath of the gods. Its entirely possible that this something was not even asterious's or anothers death- the child tablet only states that to bring "Woe" into a hosts home is what causes repercussions. interestingly, "Ichor" also mentions that the man who tried to wield the axe still has burn marks on his hands,as only "those favored by the divine" could wield it.
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.
I had to go back and replay the guest scene to catch it, but I do agree that Jean comes across as... off. I dunno if its guilt, but its clear that SOMETHING is weighing on him, and it would explain why he's sending people to the hotel, but not directly interfering. Its also possible that he was behind the MC and Clement meeting, due to how trippy and off kilter the scene of their meeting was.
I think that Jean is just the Hotel WILL and/or MC WILL to meet a X or Y, Anon said that in the Hotel objects has some kind of life in them, so I don't doubt that persons could be created to make them go there, sometimes when you wish something it wont be fate that will lead to the hotel but something that guide them to it.