That's the real issue with AVP, they can NEVER tie it in to the old movies.
The ENTIRE point of EVERY alien movie is that Ripley (and cloned Ripley) is doing everything they can to keep the aliens off earth. I mean do we throw all that out and say "Oops, little did Ripley know they were carting them in a couple hundred years ago already!"? It makes no sense. Also do we forget that it was a Derelict space craft that crashed and brought the aliens to other worlds? It was never Predators transporting them, so again, it makes no sense. The race that was in that craft created the aliens as a weapon that got loose... and it wasn't Predators.
All they can do is make some references as a tribute to the old movies, but they could never tie it in, ESPECIALLY to the Alien movies, without it having some fairly MASSIVE holes.