This sounds like a very familiar story! My three guys are about 10 to 11 months old, and they've grown up together, but right around Christmas, they started bullying this one I've got on the porch now. And he wants to go into the pen with them, but they chase him back out but if I leave him out, they freak out because he's not with them. That's why I'm hoping side-by-side runs where they can all see each other and not fight might be the answers, and maybe they can just free-range together. And the fights seem to be over food and water, not girls like I always thought they would be. Luckily, none have attacked me, but my boys are pretty skittish. I can sit down on the ground and the girls are climbing on me and eating out of my hands, but the boys keep their distance, which makes separating and catching them even harder. Mine are all khaki Campbell, but I'm hoping to add some Welsh harlequin girls in this spring. Good luck with your crew!