> I don't think Steve Jobs had a clear vision that he could communicate to others

What are you basing this on? Seems to me that Apple leadership is pretty well aligned on a shared vision despite however large it's grown. That speaks to the fact that he managed to put (or at least didn't prevent) a successful leadership structure in place that continues to succeed regardless of his presence. It's a supremely difficult challenge & aligns with a lot of the insights that David Marquet makes in Turn This Ship Around. Regardless of any of the detail differences, the only way to measure successful leadership is it's resilience to changing out individuals in any given position.