David did not create the Xenomorph

Hey guys just wanted to share a good point that why I think David didn't create or experiment with the black goo creating the original xenomorph that we all love and fear.

In Prometheus, Shaw sees how old the Engineer head is and it turns out its approximately 2,000 years old!!! So this means that the Xenomorph has existed for approx. 2,000 years old. 

Another thing I found really cool is how Ridley wanted the plot for Prometheus to be Alien... imagine that?! But the original script is that the USCSS Nostromo finds a pyramid like structure with a picture like thing on the wall warning other life forms (who knows) of the result of the black goo. Thats what the xenomorph wall carving is!!! Its warning sapient life of what the black goo results in. I decoded what I think the the wall sculpture means.