I don't know Bezos or Musk, and I'm not a CEO cult of personality member, but Bezos seems to want to be the smartest guy in the room, and if he isn't he'll elbow the other people out of the way.

Musk does seem to want to be the smartest person in the room, and he obviously likes his public person, but if he isn't the smartest doesn't seem to mind. Battery day was basically him saying high level remarks, and delegating PUBLICLY to the other extremely smart people.