Never really given that much thought
That's okay, the director's didn't either.
You know what would have made that intro far less convoluted, stupid, and cheaper?
EXT. SPACE - EARTH ORBIT
The stars twinkle, a sense of eerie isolation takes hold as we slowly drift among the heavens.
TITLE CARD : ALIENS VS PREDATOR - REQUIEM
Suddenly, one of the stars BREAKS RANK, growing in size until it is a fiery inferno before us. It is a PREDATOR SCOUT SHIP. Much like the one seen in the opening of the original PREDATOR. This one is spinning wildly off course, venting atmosphere, burning up. Pieces of hull plating chip off and trail behind it.
As the lumbering mass of burning metals passes by frame, we track it. It hits the atmosphere of EARTH with a thunderous sonic boom. Fire trail forming behind it.
I could rewrite the whole damn movie, but that's like... Two seconds of thought. It's true to the hard opening of PREDATOR, eliminating the very annoying Aliens sound effects references which serve no purpose but to piss you off and have you imagining a better movie, and it builds some mystery/suspense.
The movie can doll that information regarding the crash, out at the appropriate time. Now the Predators don't look so stupid right up front. Hell, the movie already has the revealing moment when Wolf arrives and see's what happened. They didn't need to double-down on that information.