To be fair, the one thing Musk has going for him is bringing funding to opportunities and making the most of it.
I wouldn't say that Musk is the only person who could have brought SpaceX and Tesla to where there are now, and certainly there are many individuals who contributed heavily to get them there. That being said, not many people have the money and interest to do it.
Bezos had the money and opportunity to do the same as SpaceX but hasn't been even remotely as successful. He technically started Blue Origin first, but wasted several years not taking it seriously as a rocket company; back then it was basically just a space-themed club for him and his friends (Neal Stephenson, etc.) SpaceX went balls to the walls and never let up. The day to day operations are run by Shotwell and she deserves enormous credit, but we shouldn't ignore the role Elon played in recognizing her potential, keeping her happy and letting her do her job (usually) not getting in her way. And a lot of the dreamer stuff, all the Mars colonization and Starship stuff, has Musk's fingerprints all over it. Granted, none of that stuff has actually happened or worked, but it has clearly been good for helping SpaceX recruit highly motivated talent. If you're a young aerospace engineer with something to prove in 2010, which company do you go to? The one that is sending stuff to the space station and talking about putting people on Mars? Or the one that hasn't publicly done anything and doesn't talk about anything either? SpaceX was run extremely well compared to Blue Origin, not just in terms of day to day management but also their big picture strategy.
I wouldn't say that Musk is the only person who could have brought SpaceX and Tesla to where there are now, and certainly there are many individuals who contributed heavily to get them there. That being said, not many people have the money and interest to do it.