In 1 Samuel 13-15, we see Saul displaying natural leadership, and failing at being a leader for God.
This may be shocking to us. We are all familiar with leadership in our world, as we see it in government, business, sports, the military, etc. Such leaders rally people around them and their causes - they are decisive, influential, commanding, and elevated. We expect leaders for God to be the same, but they cannot be.
Though a spiritual leader may have some of the traits of a natural leader, the spiritual leader does not display self-power, self-glory, or self-righteousness. The spiritual leader has one job, and that is to magnify God for others. If they lead in such a way that they themselves are magnified, then they fail as a spiritual leader.