Fred Wilson gets into this rather deeply. But here is the key difference
Leadership is different than management. I have said that many times before on this blog and I will say it again. I believe it to be true. Leading is charisma, strength, communication, vision, listening, calm, connecting, trust, faith, and belief. Management is recruiting, retaining, delegating, deciding, communicating, and above all executing. Many CEOs do both for their companies. But getting leadership from the founder and management from a great executive is a model that can work really well.