I really love the idea of The Dark Urge, who's on the road to redemption, actually being pushed into an Alliance with Gortash when they reunite in Act 3 affer the way their companions react to the reveal.
Because EVERYONE (barring Astarion cause hes understandably grateful actually lol, but he still calls u evil) is fucking appalled by the reveal. Karlach outright doesn't even want to look at you, which is MORE than understandable given how one of the closest people to her is getting the heart eyes from Gortash. Gale doesn't want to speak to you, Jaheira is starting to doubt and is horrified because you're not just a Bhaalspawn. But THE Bhaalspawn.
And think about it from Durge's perspective. Through dialogue choices there's option for Durge to come across as...slightly hopeless. They condemn themselves in a very self deprecating manner in some dialogue. But the one thing that makes them want to do better, is to do right by the people around them. To be a better person for them.
But here, their friends are condemning them. Yelling at Durge for being the mastermind, and as someone said in a GREAT post I'll need to track down, All this alienates Durge from their party, potentially reinstating Durge's self-hatred that they're beyond hope, and suddenly...Gortash is the only friendly face in the room.
Regardless if it's intentional on Gortash's part to alienate Durge. Here is this man who knows you, showers you in compliments but it's not...fake. not in the way you would expect from the sleazy man. He is genuinely HAPPY to see you. The first person...ever, to be genuinely happy to see you. (Because you're awful and no one is ever happy to see you rock up) AND he's got all the answers to your past.
Meanwhile behind you. Everyone is seeing you for the monster you've been telling them you are. The monster you FEAR you are.
You suddenly feel alone amongst faces you call friends. They look at you and are repulsed. And yes, of course they are. You're the Dark Urge. Murder incarnate. Why wouldn't they? And with how harsh some companions can be in this scene (again understandably) I can see a real argument for Durge losing all motivation to redeem themselves potentially. They were doing it for their friends and now their friends hate them.
But Gortash? Gortash knows Durge for the monster they are and yet they greet them like an old friend. They ARE old friends. Gortash knows the worst of Durge and yet he can't seem to wipe that smile off his face talking to them.
Maybe this is where Durge was always supposed to wind up.