David created the xenomorphs??? Don't think so. Here's why

I don't think it was a Deacon screaming because the Deacon wasn't created til humans got involved, and then it was a very specific series of events involving black goo, humans, and Engineers.  Unless Engineers got involved with humans before the events of LV-223 and created the specific series of events that led to the creation of the Deacon at the end of Prometheus (which is possible but unlikely I think), I think that is the first and last Deacon we will see because it is basically an anomaly.  

But I think you're right that David did not create the Xenos.  Like you said, they were clearly depicted in the mural in Prometheus, which was obviously constructed before David and the crew arrived.  

We now have to remember that there are multiple types of Xenos, because the black goo adapts based on the host.  The Xenos in the Prometheus mural might be very different from the one we see in Alien.  So what David actually did is create alternative forms of Xenos.  So while he may not have created them, I think Covenant is trying to show that he might be responsible for the form the Xeno takes in the original Alien film.  Perhaps he is responsible for its biomechanical nature?

Edit: SM pointed out that the shared DNA of the Engineers and humans could have possibly created a Deacon without human intervention.  So while I still don't think we can say for sure that a Deacon can be created without humans, the prospect seems less rare if you take the shared DNA into account.  Thanks SM for pointing that out.  I always loved the Deacon but I thought it was more or less an anomaly, but this gives me more hope as to whether we will ever see one again or that it is in fact involved in the creation of the Xeno.  

If david crosses android with deacon, you could end up with the classic xeno, but that design was on The derelict thousands of years earlier.

"I don't think it was a Deacon screaming because the Deacon wasn't created til humans got involved, and then it was a very specific series of events involving black goo, humans, and Engineers. "

Humans and Engineers share DNA, so if an accelerant affected male Engineer has intercourse with a female, and the resulting trilobite attacks another Engineer - hey presto - Deacon.

Has anyone thought that the original biomechanical aliens in alien/aliens are the original species and maybe the space jockey/engineers had been trying to weaponise them and experiment with them resulting in a new hazardous form of black too seen Prometheus..maybe after everything went wrong with the engineers on lv236 the space jockey took the cargo of eggs and killed all living xenos and crashed them onto lv426 to prevent getting into wrong hands again...

You know, there's a wonder punctuation mark called the period. It looks like this:    .   

It's true, David didn't create the Xenomorphs. He might have created the Protomorphs though.

The Xenomorphs were present in 2004, when AVP 1 took place.

Prometheus takes place in 2093, and Covenant takes place in 2103. Unless time travel has been invented, David did not create the Xenomorphs

This topic just keeps doing the rounds

A type of Xeno is on the mural no doubt about that, so David did not create that particular string, unless he has a hot tub time machine

Black Goo + Human DNA and some weird events = Fleashy Deacon, no bio bits

Space Jockey, Derelict and eggs are preferably at the top of the food chain (higher than the Engineers) and there is a war going on to stop the Engineers uprising?

But the Jockey looks more organic and so does the Derelict itself (bones) in the pilot room, in lieu of a metallic looking Juggernaut?

Ridders has confirmed the Jock is an Engineer, so human DNA

The way AC is shaping up, David does create something, more than likely the proto ( fleashy ) no biomechanical bits

Add Walter into the pot with his regenerative qualities, which the huggers had under the Derelict and you have the type XX121 Xeno?

David may not have created the Xeno in the mural, but he could have created the eggs under the Derelict?

The thing that's bugging me is that acid hole in the Jocks Pilot room down to the eggs?

"maybe after everything went wrong with the engineers on lv236 the space jockey took the cargo of eggs and killed all living xenos and crashed them onto lv426 to prevent getting into wrong hands again..."

If that was the case they wouldn't have sent out a signal advertising their presence.

"The Xenomorphs were present in 2004, when AVP 1 took place."

I don't imagine Riddles is taking AvP into account.

Assuming Alien: River Of Pain is considered canon there happened a lot more on the derelict than just the jockey getting chest busted. 

The remains and clues the Jordens find on the ship easily explain why there is an "acid-hole" beside the pilots seat. 

@SM

That is a good point.  But can we say for sure that a trilobite can be created without human intervention, even with the shared DNA?  At the very least, humans and engineers have a different physical stature... could this change the outcome?

Also, has the trilobite or Deacon ever appeared in any other Alien media?  I try to keep up with all the media but I haven't seen/read all of it.