I have two new 4 month old's. One is an EE and the other a RIR, they are very sweet! I also have two 6wk olds, who are in the same coop. There has not been any fighting but the EE herds the little two around and does not like them to be in the run. This is my first time introducing chickens. Is there a chance that the EE can start getting physical with the little ones? Thanks for any input!