A lot of what they're looking for (ability to lead, build a high performance organization, communicate effectively, etc.) is something that you only get through experience, of course there's always anomalies like Zuck, who beat the odds.
In Zuck case, I think when you are very good at "Does the CEO know what to do?", you can naturally know how to lead those below you, and those people can then work on that "build a high performance organization" goal.
