Well, crop is still full and his leg almost acts dislocated. I’m not sure what to do at this point and think we may have to put him down. His comb is drooping and he’s hurting.

If the crop is not emptying then I would start treating that. Feel of it and let us know if it's hard, soft, squishy, fluid/air filled, sour, etc. This article will help you with that too.
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/