They're all different, but usually cockerels will grow more bold as they get older and bigger, when the hormones kick in full force. It's best to settle them before that happens to avoid disruption of the flock because it can have an effect on egg production. Your guy is still pretty young.I agree I have two cockerels that are terrified of my rooster and don’t crow and don’t fight idk why they don’t fight it might be because they were raised together or they’re afraid my big roo will join in