I do love having roosters! Only polite ones, jerks don't need to be here, they should be someone's dinner. Do you need your cockerel? No, but why not keep him, as long as he's a nice guy.
If he continues to be good, that's wonderful, and if not, you can see what behaviors will tip you off...
I agree with everything already mentioned, and the only point I'd make concerns one of your goals, raising birds for meat. That would be your biggest meatiest cockerel, if you have one. Many hatchery Barred Rocks have been bred for egg production, and are smaller than the breed standard. See...