OK FIRSTLY...Preds arent real...Everyone got that??
OK the reason why AVP is so out of whack is because the person that thought of it is a complete MORON!!! Now, LdyPrD; Humans were not hunted until they started conquesting and began to explore the globe and take places by force, that is why the Predators only started hunting around the 1500's.
Now earth WAS a backwater planet with nothing really going for it, themost advanced races probably would have been the egyptians, but you need some sort of inspiration to advance dont you, maybe they (in theory) idolised the predators and their technologies and once shown how to build those pyramids im sure they woiuld have developed some better devices (for their environment).
Also humans worshipped the Predators, now this is fairly lucky in the predators case, as the saying goes, why buy the cow when you get the milk for free. Now if they had such an influence on the people then getting them to build a pyramid and become hosts would be easy.
No real connections its probably just how the Script Writer decided to blend it with history.