maybe rooster

So the top one is the one I think is a rooster. The bottom one is one of my other chickens I'm just using for comparison. The one I think is a boy is very pushy with the others, and I have heard it try to crow every other morning. They are around 2 months old.

So i have two barred rocks who are full size. Well, full size for them. They are bantam, so they small. One, the dominate one, is bigger, and meaner. I want to know if I introduced them when they were babies, would my old ones like them more? Would they, like, raise them? Or peck them? Im think...