I would keep #2.  Would definitely get rid of #1 because he is aggressive to people.  Would get rid of #3 because he is "shunned by the rest of the flock".  From what I've seen of chickens so far, the ones that are shunned by the flock, male or female, often seen to have something wrong with them - they are unhealthy in some way.  I think animals know when one of their kind is unhealthy, and shunning is nature's way of weeding out the weaker members of a social species.