Was Ross a Screamer?
Jason, who we find out is a screamer himself much later in the film, suggested that Ross was a screamer based on repetition and limitations in vocabulary, namely he kept saying in respose to Jason to "get off my back".
When Ross is killed we find out that he bleeds like a human indicating at the time with the information we knew about the screamers that he was in fact human, but towards the end of the movie we find out that the more advanced type screamers can bleed red blood as well as a number of other humanoid things. If we use this logic and trace it back could it be applied to Ross? was he also a screamer? and if so was Jason willing to spare one of his own kind to avoid suspension from the others? Even though he was immediately questioned of his motives right after killing Ross, but he was obviously advanced and intelligent because he got out of that one too.
People kill people so I dont see why screamers cant kill other fellow screamers as indicated in the very last scene of the movie...
Say 'No' to rubber generic Robots as seen in RoboCop 2014