Forget Predator when talking about the plot. That really had nothing to do with the Alien story. Just some stupid idea they came up with later to cash in on the success of both films.
But yeah, saw it a while ago and there are questions and holes, for sure.
That young lady sure was spry after that operation , dontcha' think? But, what the hell, its a science fiction movie. And that big guy. Pretty intelligent bunch, I would think, considering all of that technology. And yet when confronted by humans, was nothing more than a mindless, monster. Other questions that I have would only give away the plot, so I'll ahve to save them for later.
"From our orbital vantage point, we observe an earth without borders, full of peace, beauty and magnificence, and we pray that humanity as a whole can imagine a borderless world as we see it, and strive to live as one in peace."
Astronaut William C. McCool RIP, January 29, 2003 - Space Shuttle Columbia