Your friend probably got the info from the extra material in one of the Alien-boxes where Biehn said that, apparently Fox hadn't planned to pay him anything but he was pretty pissed off that they planned to use his picture without payment.I think we are getting off-topic here, but...
The real reason behind Hick's killing was budget constraints. Originally Sigourney Weaver couldn't make another Alien film because she had already sign to make another film, so the producers decided she will appear only briefly and the main characters would be Hicks and Bishop (as seen in Gibson's Aliens 3 script, now also a comic book). When Weaber told them she was again available (I don't know the reason), the producers said they couldn't bring all three characters back together.
According to a friend of mine, Hicks' actor got more money from his picture appearing for one second in Aliens 3 than for making the entire Aliens 2 film.
And yes, the Dark Horse comics tended to be better than the movies, be it Aliens, Predators, AvP or even the apparently ridiculous Aliens vs Predator vs The Terminator (which gave Ripley a real heroes' ending after Alien 4). Heck, even the AvP videogame had a better script than the film!
The Dark Horse comic about Alien 3 would have made a really good movie and also give a deeper view of the world where the Alien-movies are based in. However, I don't know Fox would have handled it if you look on how they treated Alien 3....