He only appears in 2 films. The arms are not that dissimiliar to that of the percieved ideas of many Theropod dinosaurs. Extremely small arms with very little practical use.
Before I recently watched KKE again, I was going to start a thread asking how a suit actor could have acted in the Gorosaurus suit, since the Hind Legs were so small. Of course I was just viewing the bandai toy from the mid 1990's. The actual suit has Legs that obviously mimic that of Human legs for ease of use. But I applaud the bandai figures attempt at pseudo realism.
There has never been a "Scientifically Accurate" Dinosaur portrayed on any Television Show, Movie, or Documentary. Only what the human imagination can conceive, and I'm ok with that.