Hele, tahle konspiračka je taky pěkná :)
I theorize that WeYu never knew about the derelict or Aliens at all, ONLY ASH. After all, it's becoming apparent that the Xeno's were created by David, who probably passes the knowledge only to other Androids (Walter etc. until it gets to Ash). If Weyland knew about the Derelict, why didn't they send any of Hadley's Hope people to it?? In Aliens a WeYu big wig says to Ripley "there have been people there for 20 years, and they've never complained about any hostile organism." Then Ripley finds out that it was Burke who sent a transmission to Newts family with the coordinates, telling them to investigate the Derelict. Burke only found out about it after hearing Ripley's statement in that board room. So again, I think all along the Xenos were a dirty little secret known only by Androids. Then Ash hacks into the WeYu system, replaces the original Nostromo science officer with himself, wakes up mid flight and secretly reroutes the Nostromo to find the beacon, and the rest is history.