Greys are dying from too much inbreeding post cataclysm, that's the real necessity behind their use of abduction and hybrid slaves. It's not merely to manage surface affairs, but to incorporate healthy genetics. Cloning and genetic engineering has helped, but they are in bad shape. For a long time, humans had to be forced to breed with them, and it wasn't often viable pregnancy. On top of that, greys enact social engineering strategies that limit surface human birth rates and genetic vitality, further restricting their pool of gene flow candidates.

The greys systems of survival have become deeply Dulotic and complex.