"I can tell you the extent of my work on Durance. I wrote (if I'm remembering right) some of his environmental reactivity (like, for example, what does he say when he sees a dragon or the Grieving Mother drowning in a pool of blood), and then all of his banter with other companions, and his interjections into other conversations. I also gave the player an opportunity to call him out on his self-deception and hypocrisy, because it seemed to me that some players would want to, and that they might be more inclined to keep him in their party if they could, despite him being not the nicest guy. I had to make some minor edits to get everything to line up and make sense when his dialogue was pared down for length, but not a whole lot. Chris chose what to cut, and it was fairly clean - there was a layer that could be removed without losing the base of the character. Carrie's work on the Grieving Mother would've been similar, though I'm not sure the specifics.
The cuts came for length. The three limiting factors were time to implement, art resources for the dream sequences, and VO budget. There was a target length we had set upfront for all companions, and we had to stick to it. Otherwise we'd be, for example, voicing maybe one out of every six lines for Durance and the Grieving Mother, and it'd be conspicuously incongruent with the other companions, who had maybe 2/3 of their lines voiced. Unfortunately in this case it meant cutting down characters that had had a lot of research and creative energy invested in them, and there were some good ideas there that it would've been interesting to explore. It was a shitty thing to have to do, but we'd never have been able to implement the original versions in time to ship."