Hailey, you have done a great job! So happy that he is walking, and getting food and water independently. Does he have any weakness in the one leg anymore? If you re-introduce Brownie to the rest of the flock, be very cautious and slowly let him be with them a little at a time. Dog crates with food and water inside the coop are good for gradually let them get used to him without him getting hurt. Supervised free ranging is also good. Good luck Brownie!
Edited to say: I see you are using the dog crate and he is standing on both legs.Yay!
Kailey, thank you for sharing Brownie’s amazing progress! Please don’t take this as condescending, but I have to say, I’m very proud of you. Good work and I admire your patience.