Space-Jockey???^^ Could it be that the species of "Space-Jockey" live in harmony with predator.?^^So those could be the brainy part of the civilization of the homeplanet. Predator are for the food etc and to defense the planet and "Space-Jockies" produce the technologie etc... Then, in ALIEN we saw a planet, where the "Space-Jockies" make biological weapons for their planet or, which we prefer, strong prey for the religion of predator..... That is a sooo crazy theory, but its funny^^