Theory. The role MoM gave to the foreteller still applies to the union leader. Ira, to lead the group , Ephemer, an agreed leader. Gula, an extra information to find the traitor, Brain, with the book finding the truth. Invi, a mediator and Ira's aid. Skuld, Ephemer's friend and mediator. Aced, a defacto leader acting on his own agenda, Laurium, an apperant eldest of the group, acting on his own. Iva to gather wielders. Straliza, searching for player but was killed. Can be seen as her role no longer being needed. Ventus and MoM, both have connection with the same darkness. Luxu and player, outside of the group, watching the event happen as an eye, and not interfering. Can even tied to Iva and straliza trying to find them.
I’ve been chewing this over for a bit, because this kind of ties into my thoughts on Legacy and the role it plays in Kingdom Hearts.
We first get glimpses of a wider history, beyond legend, tied to the Keyblade in KH2FM with the appearance of the Keyblade Graveyard and an armored ghost sitting in the middle of it, holding a Keyblade itself. Holding it and using it so effiectively that the reputation of hardest secret boss in the series was well-earned for quite some time.
That Legacy is further fleshed out in Birth By Sleep due to the revelation of Keyblade wielders before Sora and Riku, due to the Lingering Will being one of those wielders who handed down the legacy of the Keyblade to Riku. Explaining clearly for the first time why Riku was supposed to have the Keyblade instead of Sora, among with a number of other things like Xehanort and Castle Oblivion and etc.
I would say that pretty much every Kingdom Hearts game since then has tied itself heavily to that Legacy. The return of the Keyblade War, Unions and Foretellers and old cities full of Keyblade wielders and the X-Blade, so much.
But what is that Legacy? What does it mean? Is it simply to fight Darkness wherever it may be, fight Heartless?
Those questions may be answered in future games, but they don’t really matter so much as what the heroes in the games do with that Legacy. Because there’s another theme of the next generation doing better than the last.
We have Sora and Riku and others succeeding where the Wayfinder Trio failed, bringing that trio home as well. We have the Wayfinder Trio being able to stay together as friends where Eraqus and Xehanort failed at that. Dark Road will most likely touch on how Eraqus and Xehanort (among others?) change the Keyblade Legacy of Scala de Caelum.
Xehanort even hands over the X-Blade, the weapon he’s spent his entire life trying to get, the symbolism of reshaping the world to become better, a Legacy, to Sora himself as the end of KH3.
But most importantly for what you’ve pointed out, we have the new Union Leaders taking over the Foretellers’ positions. Maybe they do correspond directly to Foretellers in their roles. But I think it is more vital that we don’t know what Unions the kids actually came from, only that apparently Ephemer and Skuld were in the same one.
Because they are putting aside the boundaries that the Foretellers made up themselves, boundaries the Foretellers allowed themselves to fail prey to. The world they will build, to make Scala de Caelum, well. It won’t be perfect. Otherwise we wouldn’t get a Xehanort out of it.
But those Union Leaders are fitting heirs to what the Foretellers tried to do, in protecting the World and the people of it. Because in the end, it will lead to Sora and his friends.
And he is the one that will open the door.