I don't have an answer for you. They will determine that. If they were my birds, and I valued them both for what they provide the flock, I would take steps to keep them separate. The older one has established his dominance of the flock. The younger one wants to take his place. Not a good...
They will continue to fight. I would keep them separated. How old are they now? Free ranging is great. When they come in to roost they'll be in close contact though.