Stivik will slowly ascend to a more central role. At this stage he didn't have too much to do with Anni. Plus I'm building on his hate of mudokons, which didn't really come out until later in the RPG. He has to do his job at Rupture Farms, but he won't interact with mudokons any more than he has to!
This will come out more over the next two chapters, methinks.
And, ya know, not everyone hates Nick... Poor guy; he's having a really bad week
Just think Gretin, after they leave you can read here and find out what happened to them next! Happy endings all round?
There just aren't intelligent robots on Oddworld, so RG would be a bit out of place in this story. And did you really dream about Anni? Nihihihi! I am taking over your brain! Another few chapters and my evil scheme will be complete!