It was when you made up that story about the still and then telling us what the still was really meant for. Now for your so called "facts" . Facts are bud, that if you throw "possibly" in your facts you can say just about anything. Also, how is it a fact engineers went back to lv223? Or earth since your contradicting yourself AGAIN?(You know you said lv223 then earth right?) Wheres the evidence in the movie? Wheres the statement from Ridley? Show us a picture or quote that isnt fan fiction.
Facts or probabilities it's irrelevant... we are just speculating I'm not telling that anything is certain!
But these are the facts from movie:
Isle of Skye – 35020 BCE
Sumerian – 8590 BCE
Egyptian – 2470 BCE
Hittite – 1760 BCE
Babylonian – 1540 BCEMayan – 620 CE
Hawaiian – 680 CE
Obiously those two are after lv-223 outbreak... Is it a fact? Yes!
Events in Prometheus took place in 2093, Engineers on LV-223 are dead for 2000 years,
so 2093-2000=93 and those two artefacts above were created a couple of centuries after that...
Once again it's just a curiosity... Maybe it's relevant, maybe it's not...
And scene on a photo showing engineers in robes obviously took place after the outbreak (there are holes in pods!)...
But that scene never was in a movie, so I presume that its irrelevant!
I hope you thought about this...?
Watching this interview, we can speculate that Engineers did not create first Xeno... so somebody else did that (who?)!
Engineers are just a race of servants to somebody above (my speculation), and one groupe of them rebelled against that ultimate boss...https://youtu.be/zInLxITvRBo?t=23m44s