Ugh, I don't I've had enough of LV-426 for one lifetime, between Alien, Aliens and Isolation another encounter on it is just unrealistic.
Fiorina 161? Perhaps.
But adding to my variation doubts: Empress, okay but also the redundant Queen Mother? Also the ridiculous Alien King? Really? Seriously? Also the Deacon isn't a missing link, just a variation of the Neomorph due to circumstance.
Because of the information from Prometheus, Covenant and David's Drawings we now know the Pathogen works as such:
David sacrifices the Engineers against their will- wiping the planet clean and bringing forth Neomorphs.
And the Neomorph has every feature the Deacon has, except it also has back spines and a tail.
Generally in appearance is closer to Carlos Huante's concept art.
Deployment of Pathogen on a planet:
Spore Pod = Egg
Notes = Facehugger
Bloodburster = Chestburster
Neomorph = Xenomorph
I believe that in a planet wide infection, Deacons do get created-
Perhaps it even bypasses the Trilobite if the reproductive system is functional.
But it still requires indirect contact- drinking from a river that became infected for instance-
Then if sex occurred, we know the rest- the woman likely dies in birth and the man turns into a raving lunatic and is going to explode.
If it creates a Trilobite the Trilobite needs to survive until it's fully grown and then infect someone else.
If it goes straight to Deacon, which it may well do- sure.
Unlike the Neomorph being generated though- this requires two people to have sex;
Which is far, far more unlikely than some poor sod being in the initial blast radius or
looking for food in the wilderness and getting infected by spores.
This all said;
I actually believe the Deacon of Prometheus is one of a kind, and owes its skin colour to the fact it was
generated through two distinctly different beings, the Engineer and a pair of humans.
Considering literally everything else that was generated solely from one species
in the prequel films is pale white and partially translucent.
The Pathogen always creates a creature slightly different yes, but the chaos is consistent- for example;
"The original liquid atomized to particles when exposed to the air."
"The pathogen was designed to affect all non-botanical life forms.
All the animals, the 'meat', if you will... either kill them outright
or use them as incubators to spawn a hybrid form, highly aggressive."
"From the eggs, came these parasites... shock troops
of the genetic assault.Waiting for a host, entering the host...
rewriting the DNA... and ultimately... producing,
these enviable unions."
Apply deductive reasoning and you start to discover patterns in all things it creates;
The Neomorphs and LV-223 creations all have:
-Pale, translucent skin
-Extra appendages; back spines, extra fingers and a pharyngeal jaw in the Neomorphs' case.
(The unfolding appendages around the head hiding an attack method
in the case of the Hammerpedes and Trilobite, much like the pharyngeal jaw.)
Where-as I'd say the infected personnel of those on LV-223 all shared similar qualities.
The infected Sean Fifield is quite obvious, he became bloated in the cranium, with veins rising to the surface.
In behaviour became extremely aggressive and violent. It's unclear if his proportions were effected.
The infected Charlie Holloway carries many of the same traits, with veins rising to the surface of his skin
and becoming aggressive when crew members of the Prometheus tried to assist him.
I hypothesize it likely that he would have became what the "Fifield Monster" was if given time.
A prolonged death sentence.
Why death? No incubation?
Essentially because it's been stated by the production that Holloway and Fifield
were on the same path that the decapitated Engineer was on.
They showed many of the same symptoms as the infected Engineer, so I supposition that with this usage of the Pathogen;
That if infected it will; (depending upon dosage) increasingly send the victim into a violent rage,
increasing their physical attributes while returning the mental ones to that of the entirely primal;
until their cranium explodes and they finally die.
A survivor, unclouded by conscience, remorse or delusions of morality...