Thank goodness this little one is getting help. I am not an expert, only saved 1 squirrel but that paw looks really bad to me in that 1 pic. Maybe it is not as bad in real life as it looks in that picture. It looks like his whole left paw is just dangling there all mangled.
When my Sandy broke her arm I just kept her inside and nature took its course and she healed just fine without anything other than good food. I hope the same can happen with your little one. They are very tough and natural healing can do a amazing things but man it looks terrible. I feel so sorry for that squirrel.