It makes sense to me that it would be-- trollocs won't go into the city, but humans can over-ride their self-preservation instincts more. So for Padan to be sent? volunteer? could work. Also sets the stage of the later Ordeith line.
I personally love every single thing about how they adapted Shadar Logoth. Just re-read that bit mining it for quotes for tumblr and yup this is a massive improvement. The semi-sentience is such a perfect way to compress "evil that grew at the heart of the city" and something that can...