Agreed. One needs multiple roosters in a free range flock. If you have a high-grade fighter as your single mature rooster that kills every other rival on site, then you lose that one rooster for some reason, your flock is no longer self-sustainable unless you introduce a new rooster from somewhere or you had cockerel chicks waiting in the wing. Larger farms could possibly sustain enough fighting brood cocks free range if they have room to spread out. But for someone on smaller acreage they’ll only have room for one overall flock, and that one flock needs at least a couple of mature roosters.
My JF hybrids have divided into two flocks that roost separately. One flock is headed by Hei Hei, who is going on 2 years old. Hei Hei will maim rivals but he’s highly tolerant of stags that don’t have their spurs. Ragnar heads the other flock. Like Hei Hei, he tolerates stags that don’t have spurs. Ragnar is 11 months old. Whether him and Hei Hei will fight it out to the death as they age I cannot say. But their territories are not large. They can stare each other down from about 50 yards away and as long as they don’t cross an invisible line, all is well. If they were dead on game I presume they wouldn’t be able to see each other at any distance without triggering. But if they were that aggressive, they’d be unnatural.
I’m looking for birds that as far as social aggression goes behave about like wild turkeys, which seem to be the galliform most perfectly adapted for feral life in North American countryside. Yes, turkeys can be fierce. But they also retain a natural pecking order.