I think they do have different roles. I see it most in winter when the flock is most cohesive. There are the fringe girls chased off from the main group. Fringe girls lurk around the periphery as sentinels, and buckwheat call often. There are dominant hens in the thick of things, with all deferring to our dominant cock. He has his bros that are high ranked and cluster together. Then there are more subordinate cocks further out. Cocks may chase off threats, though mine don’t chase off predators, more like crows, deer and rabbits. When a hen hatches keets in the flock, there are also “Nannies” and “aunts” and “uncles” that help watch the keets when free ranging. I’ve gone from 8 guineas to 16 to 22 and now 28 during different years. Increasing the number of cocks made the Guinea flock much less interested in harassing my other poultry, chickens and ducks.I don't understand what flock dynamics are missing with 9 or fewer Guineas? Do they have specific roles that they fill?