A lot of the good leaders are not running single branded kds for periods of time but have experience in getting a few good ages in, relaxing, then repeating. There's a reason why at the top you see the same names repeatably. Probably take any leader of a top tier war kd and call that person a top war leader. Also a mediocre leader with a fantastic core can get WWs, so it's hard to say definitively what = best.