Even if you do have a chance to observe a cockerel in his current flock, his behavior can be quite different and change with time. If he is a subordinate then when given free range with hens and no dominant rooster to keep him in line you can see very different behavior. What you see is not necessarily what you get in the long run.
I had the best luck with a broody raised cockerel.
I had the best luck with a broody raised cockerel.