Agreed. The Founder seems like the type of person that would let William think he found out all the answers, likely telling William a very watered down version then letting him search for the truth behind the Founders back all the while the Founder is manipulating what info William gets. As for Idriel I get the feeling that she is some kind of special being, like a god of the afterlife and by trapping her in limbo is how the Founder got most of his control over Eternum. Orion has the 100% compatibility score which is why the dead are seeking him out but why he has that compatibility is still a question. Parentage seems unlikely and right now it feels more like someone who has talent for basketball or math, like maybe he has some mystic or psychic power that allows him to communicate with Eternum more than others. Since this world is connected to Once in a Lifetime, while they may not share story lines Once in a Lifetime canonized mystic and supernatural phenomena in this world so maybe Orion is just gifted in that. The weapons of Atlas feel like Idriels way of rebelling, at the same time it feels weird that the princess was made by Idriel so maybe they already existed but Idriel manipulated them in such a way as to be used as weapons against the Founder. The gems of doom clearly weren't made by anyone, they feel more like the Infinity Stones, fragments of that world crystalized into material form, or there was some nexus of power that was destroyed and the gems are fragments of that. Maybe the xenomorph threat is like Eternums way of cleaning house because of that event. For the Syndicate...I don't really have anything for them, but while I was writiing that all out an idea came to mind.
What if Idriel is the god or overseer of Eternum but wasn't a benevolent god. What if the Syndicate are like a rebel group fighting against Idriel. So the timeline goes something like this: Idriel rules Eternum with an iron fist, the Syndicate aren't happy but can't do anything. The Founder finds Eternum and Idriel and somehow manages to shatter her Nexus of power or throne or whatever. When that happen Idriel is weakened enough for the Founder to trap her in limbo allowing him to take control but the Nexus splits into the gems of doom and the resulting chaos allows the Syndicate to take action. All 3 sides know that some humans are more compatible with Eternum than others so they all seek to manipulate the chosen one. The Founder thinks he will be a good candidate to gather the gems so helps him along so that he can one day take Idriels place and rule over Eternum or maybe just fuck off somewhere to be a god. Idriel helps because she wants to return to power and hopes you will help her achieve this. The Syndicate want neither to win and desire some other outcome, maybe they want the chosen one to take over or maybe the chosen one can decide to sacrifice themself to create a fixed Eternum.
While Idriel does seem rather concerned with the wellbeing of the dead that could be in a "If the dead are gone I have nobody to rule over" way. Also it's thinner than a Japanese sliding door but Idriel does sometimes show up in 3s similar to Cerberus the guardian of hell which could also point to an even higher power we are not aware of yet. The Syndicate kind of feel like that mysterious 3rd faction that you don't really know is a faction until later and you kinda forget about them until they pop up doing mysterious stuff. Like I almost expect them to show up one day with a "We were the original rulers of Eternum and it was a glorius time but then Idriel came and messed it all up"
