I'll have to double check, but I don't recall the necks being that thick in Aliens. As was said before, this might just be a bad sculpt. Regarding the Predators looks in AVP, I liked it. First off, the body type WAS quite slim. It just doesnt look like it with all the protective armor and weapons equipped. When Celtic was stripped, he's far more slender looking. The mandibles, "lips", forehead and such moved much more realistically, and considering they were young adults, the shorter mandibles and extra teeth made a lot of sense. The only problem was the elder. Maybe ADI's budget ran short when they got to him. lol