Pretty much. I think the way the party was put together kind of excludes a true mutual effort, beyond working together to complete the contracts offered to us. I think the adventure is even designed that way, with the possibility of having folks associated with a variety of the patron organizations (Zhents, Lord's Alliance, Emerald Enclave, etc) who don't really work together.
But I'm easy. If it would be fun for Dent and Thaliss to start scheming between them to take over the Dessarin Valley, I can draft a new character. This seems like it would be a good place to insert one. I'd be hesitant in continuing to play Damien in a group with another set of "we promise we aren't evil" characters intent on taking over the Valley. I think the RP would lead to a PvP type situation (not necessarily combat, but still adversarial) of which I really wouldn't want to be a part. Creamsteak could certainly spin Damien off, maybe he'd become an adversary down the road.