I am a believer in multigenerational flocks, especially for raising roosters. Most people do not live with their birds, but pay visits to care for them a couple of times a day. Roosters are not highly effected by this.
A rooster raised just with flock mates, becomes much bigger than the pullets more quickly, become sexually ready much sooner than the pullets, and there is nothing there to knock some manners into him. This lets him get braver and braver and more and more bullish. If these boys have been played with by humans, they have no fear of humans either, and eventually, start to try and exert dominance over them. Usually starting with children (very dangerous for small kids) then women and finally men.
Where as a rooster chick raised with other chicks in a flock, learns right away, he and his flock mate are not the top dog, and that they all have to give way to older birds. They are often a sub flock within the flock, once the broody hen has weaned them. They get educational thumps, which keeps them in their place. Having a mature rooster in the pen, will mostly keep them from breeding most of the time. They learn proper chicken society. Chicks raised by a broody hen, are skittish around humans, they fear and respect humans, and tend to stay that way.
HOWEVER, there is no 100% this is the way to raise a perfect rooster. If you are going to keep roosters, you need a sharp knife, cause not all of them are going to work out. If you ask, I recommend a hen only flock the first year, get some experience. Roosters in my opinion take some experience. Add chicks the second year, maybe under a broody, but definitely with the flock by 3-5 weeks. Then be ready to cull down to a good one.
Mrs K