I would keep him separated at least until healed and slightly more grown. If you could house him in loft but separated by a netting barrier, I think would be fine. Remember he has no parent to run next to for protection, like your other squabs, had as growing up.
After a while,,,,,, watch the interaction when you put in with rest of your homers....

This is basically similar advice that is for integrating new chickens to existing flock.
Do you know his hatch date??? so you keep track of age? Approximate is close enough