Revolving Door
  
Ever notice how professional sports have the same coaches, year after year, even when they get fired? They just switch jerseys and move from one city to another. There's a revolving door where old coaches go in and new coaches come out.
Why? Well, there's simply a limited pool of talent perceived as being capable of doing that job. The same phenomenon happens in corporate America among "known managers" to Wall Street investors. When an LBO happens, or a company has a drastic whoopsie redo, or new "scale talent" is needed to bring the company from $100 million to $10 billion in revenues, then that pool of potentials is simply limited. So through the revolving door, you see the same people, again and again, just wearing different t-shirt logos, and hoping that they live to fight another day.
A lot like politicians and dilettantes in Washington. Same idea. Lower SAT scores.