Great story...love happy endings! Amazing he could get around on one leg...that's something you don't hear about often.I had a rooster who got snatched by a fox, his entire leg gone ! His whole left leg! Completely gone a huge hole. I freaked out but no vet was open, near me as I am in the country. I used horse medication on him that was in the shed and I wrapped his entire body in a bandage so he wouldn't try to move at all in case his organs fell out or something! Gross.. the next day he was alive surprisingly, so I kept him wrapped up tight so his skin where his leg was gone was overlapping (bit hopeful it would heal over). I fed him and cuddled him for a month straight everyday until I decided to remove the bandage, his leg hole had closed up with a huge scab in it's place. A month later he was hopping around on one foot with the best balance I've ever seen. I think if he could survive an entire amputation, your little guy can do it too!
I had a chicken that damaged the nerves in her leg, one was completely dead... and she could not stand at all. I had to pick her up and move her out of her poop several times a day. After 2 months I was about to give up. It seemed hopeless as I moved her and her food and water to a different spot each time but then she started to move a little by herself in the grass and then one day she fully recovered.