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The second branch diverges from the lore, and in Dark Messiah, it's not entirely clear. You can get rid of Zana, or you can simply kill her (if you save her from the Necropolis lair and don't banish Zana), or as a Lich (if she is killed there).
And we don't know much about Railag, so after he is sent on a quest and his unsuccessful attempt in one of the free cities, you can do anything with him.
Not much is known about the elementals either. You can take Igness from Heroes 3 (or another fire spirit, but it's easier with her; you can repaint the witch or dryad model in lava color, add some fire, and put it on the map) and build on that. Let's say she was summoned by other spirits or Askh herself to protect Askhan (in Heroes 6, there was a conversation between Namtara and Kirill, where Namtara expressed her fears and concerns for her children and the world in general).
By the way, about the Gorgons, if they don't have enough space, they can be added as neutrals.
I just had an idea, it's too crazy, but I'll share it.
We have creatures from the "old world". If Letos is hunted by his acquaintances from the "Old World", we can leave their models, give them creatures from the old castles, which will be like neutrals (as far as I know, you can add as many neutrals as you want). And Letos himself can be given dark elves mixed with dwarves in the early stages.
As I understand it, the campaign for Letos will be the first, but we need more campaigns (at least three, like in the expansions).
If we develop the Igness option, this will be the second. We can also arrange a campaign for the Nagas before the campaign with Letos, who, while waging some kind of war (or just out of spite), destroy Letos's ship.