After a quick research I found out, that the only realistic scene, where this sharptooth appears in, is off all scenes the scene, where he isn't able to bite through the branch in his mouth. In fact "it was found out, that Allosaurus did not bite particularly hard."( Dinosaur Encyclopedia 2009). So I think if the only realistic behaviour this sharptooth shows us is, that he isn't able to eat the longneck, that had climbed into his mouth, then he is pretty useless.I like the fact that another dinosaur from the jurassic period appears in this film and in fact this sharptooth keeps the story moving forward well. But he really wasn't scary or dangerous. Did you know, that the name Allosaurus means "different lizard"? This sharptooth was definitely different than the others, but not in a good way. Compared to any other sharptooth, he absolutely deserves the name "useless sharptooth".