Posted Feb-11-2018 12:26 PM
Preface: I sometimes read, but rarely contribute. That said, I've read that movie people, even Scott himself, does from time to time check out the forums. And although the story for the next installment is likely etched in stone, I have an idea for one of the final scenes that might make for a cool full-circle tie-in with the original. Forgive me if this idea has been had by a dozen others, but here goes...
To start, I assume that to pilot the ship that he and Shaw escaped with at the end of Prometheus, David may well have had to assume some type of pilot's position inside the cockpit suit that the Engineers sat in, so...
David is looking to do to Earth what he did to the Engineer homeworld. He decides that the using the Covenant for this task would take too long. He takes the Covenant to another Engineer military installation (LV-426) to get another ship and it's new cargo (the Covenant's human cargo which he converts to eggs, a process eluded to in Alien's deleted scenes) with which to attack Earth. Our survivors, released from stasis so that David can show-off his plan to them, make attempt(s) to thwart that plan.
Assuming also that David has a fair amount of biological material in his make-up, I would like to see him become a host to a chest burster. Maybe he his tricked or cornered or held captive in a situation devised by the others where he is the only potential host when a face hugger is loosed. The face hugger attaches, plants the embryo, and there is just enough biological content in him to minimally get the gestation process going.
Realizing that he has a limited amount of time to set his attack plan in motion before he bursts, he makes his way to the "stellar navigation" room, and dons the pilot's suit/seat (as I mentioned that he likely did at the end of Prometheus) to plot in an auto-pilot course to Earth. But before the automated mission lifts-off the surface, he is chest-bursted, and is rendered inoperable and/or trapped inside the suit. There he remains until and beyond when those Nostromo crew members find him in Alien.
Imagine, inside the suit that Dallas and his crewmates so closely examine, that the camera closes in on at the end of that scene, is David.
Now, I know that David would be too small to fully wear the pilot's suit, but he probably managed it at the end of Prometheus. Maybe he kneels or stands on the seat inside the suit. Also, based on what we see in Prometheus, maybe the Engineers aren't quite as tall as Alien led us to believe. I think David could make it work; it's not the first time he's done it.
A good-riddance moment for David and all his treachery. There it is. Have at it.