Bob Chapek, when he was CEO of Disney, struggled constantly against the fact that he was, in the words of former U.K. finance minister Norman Lamont, "in office but not in power." That's not his fault, so much as it's the fault of the Disney board, and especially of former board chair Bob Iger.
Why it matters: Succession planning is really hard, especially for hard-driven CEOs who consider themselves to be irreplaceable.