Been thinking...three or four players:
•engineers
•a rescue team in search of what happened to the covenant
•a science team, I think WY will have knowledge of what's happened and there is were the hunt for the "bio weapon" comes in to play.
•David himself
A long shot I know but you never know, I've mentioned this in another thread before but I strongly believe ash will make an appearance in this movie, he seems to know way to much about the xenomorph when its aboard the nostromo and I've also seen a few say David is ash!