I agree with the other posts. When you do introduce them there may be some squabbling as they will be newcomers sort of and the pecking order will have to be re-established. They may or may not get along with the others. I think the best way to introduce him to the flock is to either put him in the coop at night when the others have gone to roost or when they are free ranging with plenty of treats spread out if you free range them. I have done it both ways. When they free range they can get away if they need to and the treats will be distracting. I do spread the treats out over a good piece of real estate as I have found the older birds may try to keep the younger birds away from the treat but if they are spread out they can't guard everywhere. I do try to have a safe place for them to go to to get away from the older birds when they are getting picked on. Good luck...