But that makes no sense.
It's weird, Gibson was basically the only
writer who attempted to explain how there can believably be Aliens on the Sulaco after the second film - by having some goo the Queen stuck in Bishop when she impaled him develop into an egg... and then he went and stuck in a couple of magic adults for the lulz.
He fixed it in his second draft by just having the egg, but still. Amazing how he, Red and Ward - and then the shooting script - all had Aliens running amuck on the Sulaco without any explanation.
I just now noticed that Giler and Hill are given the story credit in those scripts, even though the screenplays were written by Gibson.
As Kiramid says, I believe Gibson worked from a loose framework given to him by the producers.