I agree with Barnyard. It very well could be that they are keeping him from the feed. Poor little tacker! Is there any way you could make a small, confined area for him? If so, please do so. Once he's confident in the new area, I would TRY putting in someone else who is at the bottom of the pecking order. They might be fine with him, especially if there were only the two; they'd only have each other, and thus may not fight. But I think that first, it would be a good idea to leave him in, get his strength up for several days or even a week or so. GOOD LUCK and keep us posted!