Picked up 4 leks from CL one is in bad shape

There are supposed to be 3 males and one female which tells you right away there is a problem. His tail looks to have been pulled off which I am told other males will do. The other two males are large and downright husky. I have removed the abused male and he seems to be greatly relieved to be out of the cage but he will not eat. I am afraid to force feed him, they are so delicate as compared to my BD. Any advice would be appreciated. He seems so sweet, of course he has touch my heart being a little ball of abuse. I have crickets and dubias. The people that had them had them from hatchling. No vitamins or anything. The other three have enjoyed calcium +D3 laced crickets already.

They are leopard Geckos just old enough to be sexually mature.