One thing that separates a good kind from a poor king is that a good king doesn’t really want to be king. It’s more of a self-acknowledgement that you’re just objectively best suited for the job. Not out of narcissism, but just a measure of ability. That’s why you’re the ruler, so people can measure up against you to realize how far they have to reach the top.
So, what I mean about a good king not really wanting to be king is that a good king doesn’t care how tall everyone else gets compared to him. He doesn’t vew others’ greatness as a threat. He views it as an opportunity to escape. If the good king is no longer objectively the greatest, then that means he gets to relinquish his title as good king, becoming a great man instead – finally free to live without worry about how his decisions affect everyone relying on his excellency.