That is good to hear. I hope he heals. You will need to very slowly get him back into the flock, but not for a long time until he is completely healed. Are you going to keep him, or give him back to your neighbor? Does she have other roosters? If you have any roosters, they may never accept him. Flock dynamics can be a real pain. If you have only hens, he might do okay in your flock. Did you get a chance to look at any of the links or videos about crop surgery? There are many more to view on YouTube if you Ggogle crop surgery. It might come in handy if his crop does not close completely. The crop is separate from the skin that covers the crop, so both layers have to be closed with superglue or stitches (thread.)