Something different within my quarantine flock is it has two groups of siblings and three single birds (all juvenile as in between 5 and 20 weeks). I have five pens for those five "groups". One individual has strong preference for a particular pen while the other are less particular. What appears to be reality is the sequence the pens are filled is determined which highest ranking group / bird is close to me at time I toss a little feed into pen. The highest ranking individual or group goes in displacing outsiders and I then close pen to repeat process at another pen with next highest ranking group / individual. This pattern breaks down if a higher ranking group / individual is of off foraging on the other side of house.