Some of the most successful people I've seen are good at only one thing: having no clue that they themselves are unexceptional - or rather that they actually are barely mediocre. BUT, they act as if they know what's going on and people give them the benefit of the doubt ie. "no one would do xxxxxx without a good reason" . The thing is, said individual is usually delusional and lacks any means of self reflection. By the time everyone realizes the fraud that has occurred, said individual has moved on to the next level of management or supposed achievement in which once again, a new bunch of rubes is ready to take direction from him or her and the cycle repeats itself.