It was obvious wasn’t it – he needed a larger base.
I’m finally happy with this piece.
…if a Genestealer infects members of another species with its genotype. The resultant changes in the genome of the host cause a fanatical loyalty to the Genestealers as well as a drastic change to their reproductive system. Their firstborn children will be hybrids, a grotesque mixture of the host’s race and Genestealers. These hybrids infect further victims, and the infection spreads exponentially. Fourth generation hybrids produce Purestrain Genestealers, and the cycle starts once again..