I definitely have bumble foot on a couple quail. I have been sitting here reading about treatment and looking at other threads, to get a plan of attack. I noticed on some other threads that the cages people pictured had the EXACT same wire that (I think) has caused this problem in my quail...
I will try to re-post with pictures of what I've got happening and how it progresses. Now at least I know to check everybody's feet and take it seriously when I see it.
I just noticed the same thing as case "a" in one of my hens today. Thank you for posting this thread with links to the images. I will have to get a dust box for that cage.