Good copilots will make good Captains. IF an uncooperative/difficult copilot gets to the LHS he'll definitely be a selfish Captain who won't establish an efficient team relationship with his F.O.'s.
Leadership and followership should always be present in the cockpit and both pilots will provide either at different times.
The Captain will always have final say at the end of the day, because it's his baby.
He who hasn't followed orders isn't fit to give orders.