David arrives at the same planet which the engineer drinks the black pathogen

A big WTF moment. 

What I think is that the planet that David takes 10 years to arrive at with Shaw is the exact planet we see at the start of Prometheus (2012) where the camera glides over the beautiful scenery full of mountains and water. We see the Engineer preparing himself to drink the black pathogen, and while he does that the elders (who appear in the deleted scene but not in the official cut) leave on their huge circular spaceship UFO. which is much different to the shoe-shape the Space-jockey engineer or military engineer tries to leave on.

In response to who the "beings" are on the planet I think they are the result of the engineer in prometheus drinking the black goo and sacrificing himself and the breakdown of his DNA. This also leads me to believe that David only destroyed the Engineers creation. It seems highly populated you can tell by looking at one of the shots from when David's ship docks with that scorpion hook. and they all gather around cheering. 

There doesn't seem to be much technology aside from that docking station/scorpion hook thing and that dome building. This could be the fact that engineers or elder engineers returned back there from time to time. 

Could it be possible that the planet david arrives at has evolved, from when the engineers first arrived in Prometheus? I would love to hear everyone's thoughts. 

Engineer from Prometheus.

A scene from Alien Covenant. (They seem to have similar nose shape. but ***almost sort of look more humanoid.  

Alien Covenant: The Crossing clip (screenshot of the home planet in Prometheus that has now evolved in the this;

Here's the clip of the Engineer sacrifice. at the start of Prometheus. 

https://www.youtube.com/watch?v=ZHpJr7_5Mjg