What would Nebuchadnezzar have needed to be a good ruler?
To have been a good ruler, Nebuchadnezzar would have needed to be a benevolent individual who possessed the love and graciousness of God and showed concern for his subjects, rather than being a despotic totalitarian whose decision-making was within himself.
Les explains that if Nebuchadnezzar had been a benevolent type individual and had the love and graciousness of God, he could have had that kind of empire. But no human has those attributes. So Nebuchadnezzar, like any other great dictator, was a despot and a totalitarian. He had no concern for his subjects, and his decision-making was within himself. Les contrasts this with Christ's coming kingdom, which will be a kingdom of one with absolute power, no confabs, and no consensus, making it glorious.