[Vespasian]

Even most people being born richer than him and why happen to have a better relationship with the family wealth don't become billionaires not to speak of the richest person on the planet.

So he definitely has some skills in leading businesses through hard times and making them succeed in the end (I've no idea how or what he does so).

Founding a company doesn't matter as much as making it grow and succeed.

Ray Kroc didn't found McDonald's (he didn't even join early) but he turned it into the massive company it is today, so it doesn't really matters who once initially signed the incorporation form.