I wrote about this in the other thread, so I won't repeat all that here, but basically I'm not sure the company was very aware of the xenomorphs prior to Ripley telling her story during the first part of the second film. The Nostromo was destroyed, so there wasn't any evidence of it ever existing. And if the company knew about the xenomorph prior to the second film, why in the world would they risk sending a bunch of space truckers? Why not get a specialized team and go check it out. Something doesn't sound right in the cannon.
If you consider Prometheus cannon, and somehow the company was eventually made aware of the Direlect before the Nostromo was even involved, it's only more reason to actually send professionals, instead of sending space truckers who might be more incline to find a way to destroy the craft, xenomorph, so on and so on. It's a huge risk on the companies part.
Something doesn't sit right.