I've just picked up on your discussion. I have two chickens whose toes are heading the direction of yours. My rooster got a good case of bumblefoot on one foot. after 9 days on antibiotics, the swelling came way down and the gangrenous color has gone away, but now two of his toes appear to be dying and look much like your pictures. We're trying to decide if we should put him down because I'm doubtful he can get around on one toe. Then I have a hen and she's got two infected toes, one on each foot. Its a long story, but it started with wounds to the tops of them, and now that the toes are very swollen it looks like she's down to the bone. The vet says she'll require amputating them but that she can get around fine without those toes. Her toes look very much like your pictures too...