I think Elon falls much more into the second category, which I agree is not really like Tony Stark, but I think still provides a ton of value to society. I think there's a real argument to be made that he is the reason we have dropped cost per pound of payload to orbit by over half with reusable rockets, even if he himself didn't invent the functionality.
But he's not a super-genius, and given how flighty he can be, when he announces various Grand Visions, it's wise to take a wait-and-see approach. His big mouth probably ought to have landed him in quite a bit of legal trouble, too, except that it's so much harder for the justice system to deal with rich people than poor people.
It's not that he's uniquely awful among successful business dudes, since much of the above is true about many of them—his PR and superfans are just... grating.
That said if you're a patron of inventors then you are an inventor. If you can manage the pain of failing and failing and failing, then in my book you're creative and a co-inventor.
That still makes him a pretty big deal, of course.
It is also probably worth nothing that they all had another trait in common. They were all notorious assholes for various reasons.
Musk's not much of an inventor, though. Certainly, that's not why he's rich.
Part of the criticism of Musk is that the popular view of him is totally out of whack with what you get if you just look at what he does, and has done. He's not Tony Stark.