My setup is different but kinda the same, 16paws. My nursery coop has a door that is made from a window. The occupants can see out and all I have to do is swing the door open to let the occupants into their little run. When the door is open, I can set the cattle panel in front of the open door and the juveniles can either join the main flock in the main run or escape back into the nursery coop if the need arises. It seemed to be working until I noted that Aggie's kids were spending more time inside and only coming out when they heard me. I also noticed that the younger birds were really spooking at any movement from the main flock. The Buff Os were giving them pecks on occasions but otherwise ignoring them. The Roos were ignoring them 100%. One of the junior Welsummer roos, BOHICA, Bo for short liked to hang out with them. He probably noticed that there are at least 4 or 5 new potential mates in the group and I can't blame him. He's my favorite of the Welsummer roosters. I really worry that the Welsummer hens are really going after the youngsters even though they have been in plain view for weeks. And with 5 Welsummer girls my alternative plans are quickly dwindling. I was out this afternoon treating the little pullet's injured neck and realized I can't have another injury like this one if my suspicions are correct. The funny thing is that the Welsummer hens and the Buff O hens from my original flock are fine with one another.
It makes me sad to see that little neck scabbed and sore, and I flinch every time I have to cut more dead skin off the flap. I don't want another injury to deal with.