You can tell how much thought Larian put into things by looking at Khaga who ends up just standing in the Hollow doing nothing and with nothing to say. IMO she would have made a more logical companion than Halsin.
Exactly! I think Kagha should have been our next companion there, instead of Halsin ditching his responsibilities to the grove and then just sitting in our camp for most of Act 2. It would've been so much cooler if he had but ordered Kagha to join our party to help us find the cure for the parasite (or at least try) and also help cleanse the Shadowed Lands as her penance for the whole Rite of Thorns debacle.
EDIT: Sorry I necro'ed such an old thread.. this popped up when I was searching for something else and I started reading... and here we are. Didn't notice the date of the previous posts until after replying.