It was Jesus himself that give the order to not judge and therefore I'd count him more important than later verses you noted.Anyway there cant be such thing as a Christian leader if you are a consistant Christian you'll avoid positions of authority where mistakes have greater costs and become an anarchist.
Christ said once that among the pagans there are kings (leaders) and this isnt the way it's to be among Christians. I think that's been forgot by mammon worshipping, leader following Babylon Christendom, opt out now and forever be a freedom fighter.
None.