I think the red one is a cockerel too. But if it were mine, I wouldn’t get rid of it until I saw the saddle feathers. Or, if I were holding it and spread out the wings and saw red shoulder patch color coming in.
The black-and-white one is definitely a cockerel, and the other chicken with the red and golden feathers with black streaks looks like a pullet. If the second chicken mentioned does not acquire any red patches in its wings or other places, then it is a pullet because of a female-specific coloring . . . but so far it looks like a pullet with those rounded feathers.