The four bigger mandibles are suppose to cover the inner jaws. They close on top on the predator "mouth". Compare the... uh bone structure of the original predator's mandibles with the others posted. On those the mandibles are just "hanging" on the sides, its like they are broken, like a human with a broken jaw that can't close his mouth. Here:
On top closed mandibles, botton open mandibles, relaxed x screaming.
Scar and Wolf are like they are permanently stuck with a broken version of the botton picture, Scar is the worse one in that. In their case the mandibles stretch to the outside even further when they scream. That's not how they are suppose to work. Plus I also didn't like Scar's human eyes, and the different mouth, on that they got Wolf right.
