Alien origin

so what do we think on the origin of the aliens? did the engineers even make them? if you remember there was a big queen mural, it looks almost like a romantic painting, like something they worship, seems odd to make a mural like that for something you made. it definitely proves the deacon isnt the first alien. was them making humans from the start their way of trying to replicate/reproduce aliens? (they only made the overgrown facehugger after a human exposed to black ooze impregnated another human) sounds overly elaborate but you never know. and the ship in the first alien the eggs were laid out almost in a ritualistic manner, definitely not laid directly by a queen. which means the ship wasnt from lv223, and that the engineers were transporting alien eggs (for study? to purge earth with one of their safer weapons since the black ooze wiped out one of their bases?) thoughts