Given the Dock'o'Naughts position on the planet, right above a huge, central area, with a temple and the circular opening with the head statues of possible Elder engineers
I bet this planet is Paradise to the Engineers because it's their "success" planet, meaning no wars, no conflict, unlike planets like ours, where we killed prophets, this planet embraced them and followed the guidance of the elder engineers.
So the dock'o'naught has been a permanent fixture for a while, so the elder engineers can come back every xx years, dock, then speak to the crowds below from their ship.
Once a ship docks, the gates and temple open for the people to flock into the central area to look up to their gods, which happens when David and Shaw dock.
This might explain why this eradication of Paradise might be mankind's undoing, the engineers come back and find a desolate planet, their prized creation destroyed and instead replaced with vicious monsters, everything they despise in a creation.
And they figure out it was humanity which was ultimately responsible, triggering a war.
The eggs we see in the trailers, are Davids creation, perhaps by using Shaw as a queen alien/human hybrid, ick!
They're loaded onto a BomberNaught (Juggernaut), to be sent to earth to finish the job, but the pilot gets infected and crashes into LV426.
The experimental facility in Prometheus was to be used to cleanse planets of failed experiments such as earth.
(Just random thoughts of mine lol)
