I watch ALOT of horror films, and sometimes they make mistakes in continuity or logic. That's what happens when you have DIFFERENT filmmakers, with DIFFERENT visions. It doesn't have to fit into a perfect package, because they are MOVIES. I don't think Ridley Scott even bothered to watch AVP, or Alien 3 and Resurrection for that matter, to look at the established continuity. There is going to be continuity issues. As movie-geeks, we have to fill in the gaps ourselves. This is just fodder for the die-hard AVP haters to say, "HA! f**k those movies!" I didn't love them either, but there is no reason it all can't make sense, and in 50 years it's just going to be even more muddled. Oh well. Enjoy them for what they are, be inspired, but don't be so literal about canon.