Why not?
What mystical gift does this one person have that 7 billion other people don't, that permits him and only him to run the company? This is a really unpopular opinion on a web site that exalts founders, but I don't think it really takes much special skill to run a company. Most (but admittedly not all) CEOs are in their position not because of their know-how, but because 1. They founded the company, and happened to be the one that flipped a coin heads 20 times in a row; or 2. They were born into that Ivy League class that closely gatekeeps CxO and SVP positions for themselves; or 3. Were descendants of one of the above.
Assuming a successful CEO is uniquely skilled is like assuming a lottery winner is uniquely skilled at winning the lottery.
I think many people, if given Elon’s financial war chest and basic knowledge of and an interest in rocketry, could have made SpaceX.