I think you might be right. Dark Urge as the MC (seeing how much that character is connected to the main story) and the party consisting of Lae'Zel (Githyanki representative), Shadowheart (Artifact/Shar connection), Gale (Mystra) and Astarion (Baldur's Gate/Vampire noble connection)
Truth be told, what I meant was literally Lae'zel, Shadow, Astarion and Gale. No Tav, No Durge. That's the party and Lae'Zel is the leader. Everyone else is supporting cast.
Now, Karlach was *always* supporting cast, she was supposed to be recruitable like Jaheira and Halsin was. Wyll was always main cast, but Wyll is.... Well, not much without Karlach, and Karlach is *clearly* the better character of the two, sad ending and lackluster quests and all. And Karlach is a late addition. I think she was always recruitable, but not intended as an Origin. But, seeing as she's recruitable right in Ac1, making her an Origin is peanuts, considering she already has interactions with most everything. But either way, Karlach is what makes Wyll remotely interesting -and she didn't even get Photoshopped into the promotional art. Even *MIZORA* is on the promotional art, see:
https://baldursgate3.game/That's not saying supporting cast is irrelevant or anything, that's like saying Gul Dukat isn't relevant to DS9, and he most certainly is. But Wyll is more like Miles O Brien on TNG. Just, nice to see again, quick hello at the transporter room, but otherwise kind of there with only a single episode where he gets to do something. Everyone on the main cast tells him what to do, and he is otherwise forgettable and interchangeable. What I'd have liked to see, then, is for him to be Miles O'Brien, but on DS9.
You know, main cast. Because he's on the poster.