If. If pigs had wings they'd fly. And if I was writing a movie where I needed flying pigs, I could give them wings.
All of this stuff is spun from the minds of the writers who create it, the directors who screw it up, the editors who cut it or pad it, in movies, books, comics, whatever.
Plot-device Man is the superhero who decides who lives and who dies, and al of the speculations about Enterprise or Millennium Falcon, Hulk versus The Thing, or peanut butter v chocolate can be kind of fun but ultimately moot at best and specious at worst.
People like to choose sides. The Aliens fans favor the xenos, the Predator fans, the yautja (a term in which I had a part in creating) and it's all good clean fun, but really, some folks take it waaaay too seriously. The color of the lint in Ripley's pocket last Tuesday really doesn't interest me, or most people who watch the movies, or read the graphic or prose novels, it really doesn't, and since I, or anybody else who gets to write one of these can mess with that, it really doesn't pay to get too attached to it.
I hear the same thing in the Star Wars universe, the Indiana Jones universe, and back when I was doing 'em, the Conan, Batman, and Spider Man universe.
Oh, Princess Leia would never do that! a fan writes, royally pissed-off at me.
Well, two things: 1) Yes, she would, because she did. 2) There is no Princess Leia, dude. Somebody made her up, and what you think about when you imagine her is Carrie Fisher, an actress playing a part.
People buy books and go see movies, and for that reason, the Aliens and the Predators are going to keep losing. Might win a battle now and the, but not the war. No money in that. Last time I looked, imaginary characters didn't buy a lot of popcorn ...
I might write another book in one of the series someday, I'm not ruling it out, 'cause they were fun to do.