I'm glad to see this thread; I was mowing my yard yesterday and kept thinking, "I wonder what's going on with Zane..."
I have a cockatiel dealing with similar issues, and the avian vet (just this morning) said that even if full muscle and nerve regeneration doesn't happen, if we can get the toes uncurled and keep them relatively flat, he can still use the foot for balance and let the other leg do most of the weight bearing. Would it be the same for Zane? I certainly do hope so. For little critters, they surely do take up lots of room in our hearts...
As for the other issue, I know we think of our roos as proud, (and I know they most assuredly do have emotions), but I wonder if we may read a bit too much into the pride part of it. If he was with some of the more even tempered girls and in a "handicap accessible" coop with modifications, wouldn't he be back to loving life again? Seems like as strong a will to live as he has demonstrated, he wants to live, with everything within him. I hope I haven't offended anyone or overstepped any bounds, I just feel such an affinity for a roo and his family I've never even met; just have seen their pix. Best to you and yours, speckledhen.