Every large company develops internal politics with various degrees of harm to itself and its performance. If the business is led by a non-founder, non-technical, non-performing CEO it is a given that he will always feel like an insecure usurper/impostor more concerned about protecting their job from rivals than actually leading.
This is yet another data point in support of Andressen Horowitz's thesis about backing founding CEOs. I might add that's also a strike against promoting a head of sales to CEO.