I don’t know, who started a car/rocket company in question? Because they were both bought by Elon after the fact, including the “founding” title (because, narcissism/selling this image of successful CEO)
You are right. Elon didnt file the incorporation papers, he only took it from a grarage startup to the worlds most valuable car maker. Clearly the founder who never shiped a car is is the one who deserves credit, not Elon.
And surely it is worth as much as all the other car manufacturers combined.. oh, maybe stock values are not to be taken to literally?
SpaceX was co-founded by Musk, not purchased from someone else. So ding him on purchasing Tesla all you want; SpaceX is homegrown.