Our cockerels are raised in our mixed aged flock, and we watch them. Human aggression is a cull point, as is any health or conformation issue. Not to show standard necessarily, but health and a lack of physical defects are important. Then, there's time to sort out individuals, as long as the...
@Mrs. K has good advice here, as usual. We've had chickens a lot longer, and our first rooster was a miserable little beast, kept too long. We learned!
Your cockerels are so far behaving well, and if you want to keep one of them, it's too soon to really know which (if either).
Raising...