Langdon, well done on asking questions. Its the only way you will find out the answers isn't it!!!
I have numerous cockerels, and they did have a few skirmishes at first, but are all roughly the same age, and seem to have an agreement amongst themselves, that they have their own ladies, and keep to their own bit of field. Having said that, 4 of them do hang out together, but only one of those seems to tread the hens, doubt the others are allowed!!