To me this is the fascinating thing about Musk that really sets him apart: He has succeeded at building several companies that make real stuff and tackle hard engineering challenges. And it's not just having money to throw at the problem, we know that because Bezos also wanted a Rocket company and threw tons of Cash at it.

Hard to say from the outside what it is exactly that allows him to do that. It makes sense that its hard to say what it is, because if it was easy to describe, chances are it wouldn't be what sets him apart (the other option being that it's hard to emulate).