I don't know if this has been discussed before, probably has, but on my 7-millionth re-viewing of Aliens, I can't help but wonder if Burke was assigned to Ripley on purpose, and knew something about the Xenomorph all along.
His scenes at Gateway and during the inquest give me the impression he could be representing a covert corporate agenda, even if the alien itself was unknown to him.
Maybe a superior assigned him to Ripley specifically, due to his loyalty to the company, without telling him any specifics. They could've just tasked him with digging up whatever he could find about the Nostromo incident, even further than what Van Leuwen and the ICC were able to reveal.
The only two options are that the company had no clue about the Xenomorph or LV-426, meaning that whoever was responsible for the Alien debacle wiped the records clean, or they knew of it but maybe not specifics, not the planet or the region of the planet, perhaps?
This could lead into a grand conspiracy hinting at Hadley's Hope being established as a front in order for WY to search for a Derelict that had gone missing, and couldn't be picked up by scans of any kind. It wouldn't be a 'front' necessarily, because the colony has its own reasons for being there, but it would help explain why they would set up shop out on 426, a planet in the middle of nowhere, cosmically speaking.
I'm sure the Colonial Marines game will touch on some of this. Thoughts?