I was going to post something similar. Us humans sure do love our social hierarchies. Most people find it untenable that random chance and/or the independent actions of a multitude of phenomena make up a great deal of what we perceive as reality. We are heavily biased towards order both as a means to explain the world around us and operate within it. It's why so many people fall prey to conspiracy theories. There's a comfort in knowing everything is under control. I have a pet hypothesis that the invention of Gods went like this:
Uggg: When I look up at the sky, I more or less see the same thing day after day. However, the events that happen infrequently, the eclipses, blood moons, shooting stars, gamma Ray bursts, etc. shows a level of variance and complexity beyond measure and comprehension.
Krug: Even though it looks random and chaotic, there's gotta be some big guy up there behind the curtain. Otherwise, what's the point?
Uggg:Yeah, that's too depressing. Life is brutish enough as it is. We're still part of the frakkin food chain! Let's not consider existentialism for another 20,000 years. Big wizard guy in the sky it is!
That type of thinking permeates in all facets, so we think it's only natural the guy on top is the essential person in a company.
I've had the fortune of working at startups that were comprised of intelligent and talented people from bottom to top. In fact, at a couple of gigs, the ceo doggedly tried to keep their original vision as their fortunes sank. It was the non c-level employees that recommended and executed plans to pivot.
There are those rare unicorns like Elon and Jobs. Although they consistently work with some of the most talented people in the world across multiple disciplines, they set forth a vision that would be considered ludicrous by almost any standard. Yet, whether it's by cult of personality or some other rare trait they consistently have success across different fields. Also, it is important to distinguish founder/CEO's who generally risk all they have on something that is likely to fail.
Just throwing numbers out there, but I'd wager that 95% of current CEO don't come up with anything groundbreaking and are executing pretty standardized plans for the duration of their tenure. Personal relationships do matter, but their importance generally has an inverse relationship to the size of your company