That average relative valuation is a good way to think about it. I would propose that most people don't believe in the exponential potential of individuals, so you'll find that people undervaluing the top CEOs outweigh those overvaluing them.
Yeah, I definitely agree to some extent. I've worked with enough people like this to know that there are 100x engineers, and 100x CEOs, and so forth. But I wouldn't assume that every 100x CEO succeeds. It's a contributing factor, but luck still plays an outsize part.