You just wrote an excellent article there on treating bumblefoot! Please consider making it one by clicking the Articles tab. https://www.backyardchickens.com/articles/categories/injuries-diseases-cures.29/Happy to help others out there. Bumble foot occurs mostly in heavier breeds, that might be exposed to moist ground on regular basis but sometimes it just happens from soft foot pads getting damaged and allows bacterial infection underneath skin. For treatment, I soak foot in warm epsom salt solution for 5-10 min, sterilize with vetrycin spray or chlorhexidine. This softens black cap of granuloma which can be pulled off gently with tweezers. There will be a white to yellow mass of cheesy pus (dead skin cells) that also needs to be gently flushed or tweezed out. I use an orthodontic syringe like what i use to flush dental abscess for my elderly rabbit. It’s best to not dig too deep, but try to remove as much dead tissue as possible without causing stress to your bird. They do bleed a lot from foot pad area. So, cleanse again with vetrycin spray, apply pressure if bleeding for a couple minutes, pat dry and generously apply Vaseline over open sore. Finally, wrap with stretchy vet gauze, but never too tightly. I try to do the procedure in late afternoon or before their bedtime so I know they will leave their bandage alone overnight. I check first thing in morning. It takes about 3-4 days before healed enough to remove bandage. Then it’s just maintenance and keeping foot clean from debris. And ensuring coop/run stay dry & clean. Hope this helps.