Franklin Roosevelt was famous for his tolerance for ambiguity. In the scope of leadership styles, on many difficult and uncertain occasions, he was the supreme delegator.
Among those that practice this style with aplomb, and Roosevelt was certainly one, a good deal of trust flows down, ceremony is minimum, and for the one who is the "paper at the bottom of the birdcage", there is no help coming from above!
And, expect not only ambiguity, but also competition. It's common for delegating leaders to empower more than one and let the best rise to the top!
