I house three bantam cockerels with their dad at night with no problems. I have 8 cockerels of various breeds free ranging with the hens. Most of them have been here since chicks, but some came at an older age. All respect each other and keep to their own part of the field with their own selection of ladies.
If they are reared together they tend to be ok, although the skirmishes do start when they get interested in the ladies. Like I say, mine get along fine.
I can bet your will get more cockerels than pullets - I always do each time.