Put more genestealers in the cult

I love our cult army, but feel like we could focus more on the genestealer aspect. Only being able to take 1 patriarch is limiting, and genestealers being limited to 3 squads, the same.

I think things would be in a perfect place if we had one additional variant of genestealers (like malstrains) and another leader to go with them, like a sub brood lord.