David did not create the Xeno

The eggs could have grown inside the juggernaut ship in alien.( to give the original xeno)...and let's say it was David or shaw who some how got into a biomechanical suit and a time travel senerio  .they would need another ship. Because the one David/shaw seems to crash land and the one in alien are two totally different ships ( in structural design)

Biomechanics is how engineers roll. It's their entire technology. Wonder if the black goo is derived from how Queens make eggs.

Egg morphing was something that RS had no problem believing could coincide with the Queen concept. I think he said that on the Alien special edition DVD commentary.  The argument could be made that the Prometheus mural actually depicts egg morphing. Though it's a bit stylized and difficult to make out, so up for interpretation. To the left and right of the central xeno you see humans in fetal positions appear to be melting into an egg shape. 

I could be reaching, but what if the Xenos have ALWAYS been turning us into eggs, and the queen produces something like human genetic material to inject with her retroviral catalyst to produce a new one in the sack. We are biomass for her hive. So it becomes who came first, the Queen or the Engineer.

I can see a group of Engineers rebelling against breeding more biomass for an organism that uses them like incubators as well. So they create their own version of goo trying to reverse engineer and eradicate the Xenos and the lesser chattel (us).

The life cycle of the Xeno never really fit as a bioweapon. The drones are too hard to catch and transport. The queen doubly so. The eggs awkward to deliver.  The Xenos aren't manufactured for the Engineer race. They manufacture us for the Xenos.

The Reaper Faction is clearly the one that rebels. They decide to wipe us out so that we don't become a planet wide Xeno hive.

It takes a certain level of population to justify a certain level of technology. Once we've accomplished FTL the population is probably in the billions so they point us to 223. When we arrive, the sowers say "Take this back to your planet it is your true purpose" and hand over eggs for us to take back. The infestation spreads quickly after that.

The reapers round up the eggs. The design of their exosuits even makes face hugging unlikely once they are in them, but the goo didn't care about the suits when they lost containment.

I just feel that to produce the Xeno in Alien it looks like it will need android elements to complete the job. Now there are 2 androids in AC, I can see one being victim to the final egg process, then to complete the story arc the remaing android goes back to the Derelict and placing the eggs and await the next victims, just my theory on how it could pan out

What if the engineers have advanced to the point where they have acheived the singularity, ie, they are essentially immortal because they have transferred their essence into a living machine body.   The LV223 engineers are much more biomechanical looking than the sacrificial engineer, so if one of those guys got facehugged, could it produce the xeno we saw in Alien.   IDK, but it's worth thinking about any way.

I wonder if there are different ways that the Xeno can be created and that it has been done before? If David re-creates the Xeno then he isn’t the one that gave birth to it first, I think that could be an interesting thing. The idea of David being the one that created it first is nothing that I like so I hope that isn’t the case.

I don't think David creates anything, he just turns it loose.

David's tampering in Prometheus ultimately resulted in the Deacon, with the knowledge,time and vehicle he now has at his disposal, I feel the final mix to produce the Xeno egg / hugger in Alien will have a lot to do with him or Walter. I'm sure in 1979 Ridders gave no thought to having to link this all up, however he's now 'quoted'that he will. I'm a massive fan of the orininal Jockey and its mystery and I do hope it gets the tie in it deserves, I just feel he will go with synthetic tampering to produce this particular string of Xeno that everyone wants to get their hands on

Fun fact: there's no WAY the egg chamber is part of the derelict. My best explanation: it's an existing repository that the derelict crashed into. 

@Myrddin365

Ive always thought underneath the Derelict, what better place to store your perfected eggs with a huge Derelict Flag on top of it, that's if you wanted someone else to find them in the future?

It's one of those frustrating things you don't think about until later, and then you're like... Wait... How did that get there? Cuz it looks like the engineers built the egg cavern, too.

@Deep Space

Once again.. indeed i think that has to be close to the Ball Park.

@Myrddin365

Very good solid points

@Goddamn Tropics in here

Indeed the Original was Bio-Mechanical.. even though the Egg and Face Huger Stage was not....  Maybe a Lindeloff could come in and have Kane actually be a Synthetic Construct working for the company lol... Joke ;)

They could lead us anywhere with this, its a Big Mess for sure lots of inconsistencies...  I think the movie teases David or Walter role.... But i think its maybe a Red Herring..

Who knows... the Xeno was around before... due to LV-223 and the Mural... but these could be related DNA that has not yet got the Mechanical/Synthetic Part of the Bio-Mechanical Look.

So they could show the Derelict was a ONE OFF... a Event where something infected the Space Jockey.. similar to the Chest Buster Cryo-Sleep Engineers in Prometheus.

His Ship Crash Lands... and the Black Goo Cargo gets compromised and Split and leaks all over and something somehow .... in this ONE OFF Accident Creates something that causes the Bio-Mechanics.... Over Time the Ship degrades and is infected... where its once Mechanics are now Fussed with the Black Goo and something that trigger this to happen or Evolve over time...

But we dont know for sure where they are going....

The Egg Silo is a inconsistency... unless as stated before we have Tardis Type Technology at play.. (God forbid Time Travel part too).

Maybe it could be described as landing on a Cave of Sorts and well the Mechanics get infected with the Black Goo so that now the Synthetic Elements are merged with the Black Goo and we get basically Bio-Mechanical Transformers kind of stuff going on... where the goo now operates as Nano-Parasite/Synthetic and can build Machinery too.

Or maybe something like this EXISTS... and the Engineers Re-Engineered off it...

As far as David...

He could re-create something similar.... if has the knowledge and tools..

And maybe the Bio-Mechanics are just a ONE OFF Event?

But Ridely had teased we would find out why it was Bio-Mechanical and a Weapon.... which seems to indicate the Xenomorph was purposely created from something to have those Bio-Mechanical Features...

I think loosely we can get clues... but i am not sure Ridley would give on his Promise.. well Comment we would find out exactly Why/Who created it and HOW.. i think some Mystery will be kept... at least until he ties it up with the Last Movie

my take on a WMD is total destruction, not replacing one creature with another. unless ofcourse u have no intention to ever set foot on that world again in which case it doesn't really matter. but my take on it all is the engineers create man, man becomes aggressive and r seen as a future threat so they decide to wipe us out but the goo is meant to possibly be dumped in our water, maximum impact as we all need it to survive but life would continue and evolve again. xeno's mean a hostile world that would be uninhabitable by anyone again so doesn't tie in with the perception given of the engineers at the beginning of Prometheus. the xeno also is a total fluke of circumstance and the mutation of fiefield and the worm also as they are infected in a different manner. OR...... this is what is meant to happen and the original goo has been altered and we were to be test subjects?????

Its pretty open really.....

Indeed the possibility is  the Engineers created Mankind without Permission of their Hierarchy, or the Engineers decided to interfere and evolve us or teach us stuff and get us to worship them against the will of the Hierarchy.

Maybe Punishment was sent to those Engineers.. this failed... the surviving Engineers then re-weaponized it to use against their creators... and then proceed to try and get Mankind to worship them.. 

We we proved as rebellious and loyal to them as they was to their creators..... or Hierarchy..

They realised the Punishment that lead to the Ancestor to the Xenomorph... lead to something they then saw as a more Perfect Creation than the intended Creations... and that the Mural Deacon/Xeno was either seen as the Perfect Form from Engineer Sacrifice...  or this was the aim.

So they then saw the Mural Organism DNA as being more Perfect than their own Engineer DNA.... and decided to use this to Evolve Life on Earth....   being as though we had evolved to a point that displeased them.

@BigDave very plausible. It's fun to have all these ideas about the back story, but frustrating when none of them are confirmed or denied in the film.