So far, 4, 6, and 10 are the ones I would keep an eye on as suspected cockerels but none of them have color yet. I guess a couple more weeks is needed.
Soon, if not already, you will start seeing larger and redder combs and developing wattles on the suspected cockerels. When you post pics get a head shot and broad side shot of them.
You can probably post pics now of your suspected cockerels and people who have those breeds will be able to...