I wish we could keep Dasan like a Pet like we did with the Orc dude that killed MC's father. He is an Asswipe, but killing or kicking him off locks you out of scenes.
Chieftain Dasan route: The same amount of work than the Chieftain MC route + you have to share Tia + have to ask for his permission in every important decision. The MC is Dasan's overworked secretary.
Unless you use Dasan as a Scout (which mean less work for the MC) or a Meat Shield or he provides another service to his people I don't see the point of letting him remain in Rumah.
In the locked out scenes you are basically sharing the women, whom you win over with your effort, time and gifts, with a coward, for free.
Slave Gurtak is basically neglecting his Orc's duties and betraying his people, but he is useful.
Slave Dasan would need to be twice the man his father wanted him to be to redeem himself.
Backstabbing his father is the game's greatest sin.