Re: Spot on.
Curiously Hitler was an abysmal manager *on purpose*. It is a well known ploy of people at the top of the power tree to assign overlapping responsibilities to their underlings so that they spend a great deal of time on internal turf wars to gain power over their peers - which distracts them from forming alliances to depose the obergruppenfuhrer.
Truly great leaders don't feel compelled to do this.