Hopefully he gets strong enough to survive in a flock - chickens can be awfully tough on the weak. I took in 4 pullets, almost fully grown, at Thanksgiving. One was poorly when they arrived, but seemed to rally. However since integrating them into the main flock she has been on the sidelines. She has been holding her own, until yesterday our unusually warm weather and rain almost did her in - I found her wet and hungry, afraid to go inside and eat. I carried her in and stayed with her until she had a big meal, then put her up high to dry out. At dark I had to take her inside again, as she was too scared to go in, even though all the other hens had gone to roost. She is going to have to figure it out, as I am leaving the end of the week, and there will not be anyone to put her in at bedtime. Her 3 sisters have learned how to eat when the others are outside. I have added another feeder.
These bantam speckled Sussex boys are so easy - I have had as many as 5 roosters all on one pen with not one fight. They hang out together like bros.