The Great-Man Myth may well be a bit of a myth, but there also must be some truth to it. Rather than describe Steve Jobs as an "inventor," I think he could better be described as an "innovator." I'm not sure he invented much of anything: he didn't invent the Apple I and Apple II (Wozniak did), and he didn't invent the GUI (Xerox Parc and others did.) Instead, he brought emerging technology together in an innovative way to create new categories of products such as the Macintosh, iPod, iPad, and iPhone. Each of those were composed of a set of inventions created by others but brought together under Jobs' direction. Likewise, he didn't invent computer animation at Pixar (which was already doing that when he acquired it), but he guided Pixar through the process of creating the first feature-length computer-animated movie.
So, for a serial innovator like Jobs or Musk, there seems to be an element of greatness in the fact that they have a vision and organize others to implement that vision. But its likely that they get more than their share of the limelight in the process of the media simplifying and glamorizing their stories for consumption by the masses. Edison actively encouraged that sort of thing in the media of the time, by promoting the idea that he was the great inventor, whereas he actually ran the first industrial research laboratory - which itself is one of his primary inventions.
In the case of the Apple I and II, Wozniak seems to get his fair share of credit since he did all of the engineering himself, but for other things, a team of people is involved, and it's rare for them to get much credit. Except in the case of the first Macintosh, where the designers got to sign the inside of the case.
So, like most myths, there's some truth to the Greate-Man Myth, though it's also, of course, a bit of a "myth."