We have ten total so if we do have 4 I don't know if they could live in peace with only 6 hens. My husband does the culling and I helped after when they didn't look like my pets anymore. It was easier that way. He said he did have a hard time doing it tho. We wouldn't tolerate an aggressive bird at all. I have two boys 7 and 9 and another on the way due in July. How many roos do you plan to keep? We are in a rural area with tons of predators so I think maybe the best 2 in case something happened to one.
I have one roo to two hens (eight or nine weeks old, but I'm fairly certain I have a male since the development of crown and waddles plus the "rounding up"). If he is indeed a roo, and ends up being aggressive, I will turn him into stew very quickly.
I have a 2yr old son and will not tolerate an aggressive rooster. He is sweet for now, but if that changes I will do it myself. My fiance and I do not want that to be the case, but family first, and animals unfortunately come second.
Edit: we love in s rural area and it is hard to find anyone who wants a rooster