Man, these are just a metaphorical and symbolical references... Xeno is a metaphor of creation made by those who thought that they are Gods (Satan thougt that he is better than God). Creations of those who want to top Gods creation will become a destroyers of their creators... Who made the Xenomorph? Probably those who wanted to top ultimate creator (fallen angels - just a reference), but you cant top that entity. Humans created David, but the paradox of that creation is that David could become superior to Humans... thats the trick with creation... to create doesnt mean you are God!!! But the nice question will remain, who is the ultimate creator? Life is born from death, death from life... where is God? God must be all that at the same time, and none of those things. Who is God? What is God? All things at the same time and none of them. "He" is not created, but "he" "created"... Knowledge/ IS GOD (logos)... Its not created but it "created all there is"... its not material, but can be "materialised"...it can be nothing, and everything at the same time. What is existance? Materialisation (projection) of non existance, materialisation of knowledge (all things have their mathematical/physical/chemical properties which are in their essence knowledge of something, and therefore non material things). Life and material things (a materialisation of existance/of knowledge) came from death/void/chaos (dematerialised existence----knowledge... its non existent and existent at the sam time), and death came from life. God is everything and nothing, knowledge is everything and nothing (a true/false illusion). But how can something non material become material? How can you make space, planets, Humans without elements such as Oxygen, Hydrogen, Carbon,...? How can you have number 1 from zero (0); you can have 0 from 1 (when you introduce another number 1), but first option is not imaginable to us...? Imaginable... What if 0 and 1 are the same - what if they are both same becuse they represent the same thing - NOTHING AT ALL... (nihil fit ex nihilo)... "Out of nothing, nothing [be]comes." There is nothing... So duality of death and life is not at all "duality" but modality of the same thing. Good and bad are duality of the same thing (not duality at all)... Only sentient "creatures" percive things in a different way, they see some difference (because they observe only visible,sensible and measurable thing which are in fact not visible, sensible or measurable)... is there a difference? When you are born you see and feel numerous different expiriances, objects, things... you sense, comperhend the world around you... but like numbers, 1, 2, 3, 4, ...... all those things: senses, expiriances, existance; they are all just a variations of the same number - 0 (ZERO). They came from nothing, and therefor all of them are also nothing. You dont need a cause for nonexistent thing! Its all just an illusion.
Philosophy is dangerous, and I am not good at philosophy but I wanted to explore one thing that Weyland said before he "died": "There is nothing", and then David said to him: "I know! Good journey mr. Weyland." David as a soulless machine can comperhend that there is no causality, reason, purpose, there is just this illusion... so things like immortality, life, death and God are not important at all, because they are all the same. We are in a loop of endless illusion.
I dont want too much difficult philosophical questions in Prometheus... more mystery and horror please; and some sensible answers to numerous questions that Prometheus delightfully asked.