I am having a similar problem and was wondering, how long does it take to establish the flock hierarchy and do you interfere when one is being chased? mine seem to know not to mess with them if i am standing there, but if i am out of sight, they go after the one pullet- the older ones are 3 months old and have been with the others who are 2 months old with a divider, the older pullets are fine unless the RIR starts up again, then its a freefor all chasing Pipi the production red around... beginning to think i will have to keep pipi away from them?