Sally, my first chickens ever- RIRs, hatchery stock, were the worst ever at having new chickens added to the flock. They were the first and only in their little brains and they were rabid in their enforcement. Since their demise many years ago, I have not gotten any more RIRs except for a rose - comb from Sandhills, and she is a sweetie. I have not had any issues since then, but I also now have roosters and the flock is a mixed combo of whatever has been added and hatched up here.