I found a comment on an article speculating how this film and the first Alien film tie in together. I thought it was interesting and probably on point.
"At the end of the film, David tells Shaw that there were many space craft left on the planet (LV-233). Earlier, as we witnessed the Engineers' recordings, something horrible was set had been set loose, sending the Engineers running for their ships to escape the planet. Most of them not making it, their bodies piled up by hangar doors. My guess is that one of the Engineers had escaped successfully escaped LV-233 in a ship, only to be killed by a a chest burster, which caused him to crash on LV-426, the planet Ripley, Dallas and the rest of the crew of the Nostromo, would later find him. So in a way, I can now see how Ridley Scott means that this is not a prequel. LV-426 takes on a story line of it's own. Shaw heading to the Engineers planet never has to come in contact, nor have anything to do with, what happens on LV-426."
Sorry, this might have been apparent to some but I didnt really put two and two together.