It really seems to me like making Halsin and Minthara companionos was a mistake on Larian's part. Most people seem unhappy, they have to spend so much time and money constantly fixing and adding things to make the inclusion work, and it just makes other stuff confusing and complicated in turn. I think Larian would have been better off not listening to fans on this one. Clearly taking characters who aren't meant to be companions and making them companions is just a bad idea. Hopefully they've learned their lesson and don't repeat this mistake with any of the other characters people are asking for.