Wow, this thread is amazing. Lori, you're doing such a fantastic job, and it seems like Kubota is drawing on your energy, love, and hard work to get himself healed!
Chickens really are amazingly resilient animals. I have one girl recovering from a coyote bite (pretty large chunk taken out of her back) and the rate at which she is healing is astounding, esp. when a human with a comparably-sized injury would be in the hospital for weeks. When they don't want to give up, it's hard to stop them!
Good luck and I look forward to seeing how this works out for you and Kubota (love his name, BTW!).