With so few females to argue about, I believe your cockerels will end up fighting if their both loose. Cockerels and roosters fight over females and resources. Whoever is subservient could end up living peacefully, but that's usually with a larger flock. The dominant one would end up trying...
Yes, He's a rooster, he looks full grown. I'd guess a NH, but maybe a production red? I'm not an expert on that breed. I think somebody sold you a rooster, fully aware that this was not a hen.
But for future reference... And this is only applicable to chickens that are around 12 weeks and older.