Sorry i'll dumb it down for the kiddes....
Chestburster embryo what ever you want to call it....uses the Facehugger for transportation/implantation (to get in someone kiddes)
Facehugger needs egg from protection...
Xeno...i already looked at that and Alien fans will never be satified. there is no way to win....i just wish i could se what would happen with Cameron or Ridley at the helm and how many complaints they get...
Also this is what i was responding to...to make it clearer "To argue that the chestburster embryo builds first then grows a facehugger around it, and then the egg around that, is sad. Its pretty ridiculous."