A Leadership Paradox
Are the capabilities of a CEO leader similar to the leadership needs of a ScrumMaster or Agile team leader? I think they are very similar. And if so then the risk factors that are associated with CEO succession planning would also effect the Scrum team's succession planning (assuming anyone is concerned about the leadership changes to a Scrum team).
So let's look for the fractal nature of self similar systems within the Agile company.
One conclusion what that selection criteria for CEOs may focus too little concern for the human collaboration side of the equation. Something that Agile values and principles embrace. I feel there may be a systemic problem with leadership Emotional Intelligence (EI).