Breeding roosters or young cockerels generally do not chase the pullets or hens for that matter that have not colored up on the comb and cheeks. Probably an evolutionary thing since any roosters that did chase after non breeding hens or pullets very rarely passed on their line.
14 hens for 2 roosters in limited space is the recipe for dominance fights on a regular basis. The one to be concerned about is the new rooster. He's probably gonna take a beating.