What breed are your roosters? Some breeds are more easy-going than others. Right now, I have 2 Orpington cockerels around 9 months old with a free range flock of around 14 hens, plus 3 "teenage" Orpington cockerels (maybe 3 months old?) that I'm growing out with the free range to decide which ones to keep as back-ups. All the boys get along fine. The older cockerels decided a while ago which one was the head of the flock but they both breed the hens and crow and have a generally chicken-y good time.
Conversely, we have an all-rooster flock in our sheep pasture, including "charity case" bantams, breeding stock grow-outs, and ones we intend for butchering. Even though it's an all male flock and the free range hens don't go up there, we had a LOT of problems with several of the roosters, mostly Olive Eggers, who spent their entire day attacking and "mating" the smaller or subordinate roosters. The mean roosters recently got sent to "freezer camp" and the remaining seven roosters get along perfectly politely with each other.
So I think it depends on breed, roaming space, and individual personalities.