You can form a baseball team entirely out of players. They might even play pretty well. You just can't form a baseball team entirely out of managers. If the up

You can form a baseball team entirely out of players. They might even play pretty well. You just can't form a baseball team entirely out of managers. If the upper levels are in more uncertain and ambiguous situations, that makes it even harder to judge performance, which will give even greater weight to wild heuristic guesses in hiring, and more cover for things like nepotism.