I don't see anything much that's non-obvious here. - Go small to go big = It's easier to be CEO in a smaller company. Kind of obvious. - Inherit a Big Mess = It's easier to be CEO in a situation where nobody wants to be CEO. Kind of obvious, too. - Make a big leap = Take risky bets, in which case you're not represented in the sample of CEOs when they don't play out.
The non-obvious thing was that the author walks blindly into every single survivorship bias there is and then draws a definitive conclusion based on them.
They reverse engineer CEO's trackrecords... Good thing all these CEO's are blissfully unaware of their relative luck and build upon their own ability to fix anything.