What lead to you thinking Elon musk will be the person ? we have Michael Saylor a bitcoin guy that buys and market react to it you haven't thought of such a person and you went straight to mention Elon? someone who only wanted bitcoin for customers to patronize his business this are not true bitcoiners, if you see one you will know.
Perhaps whoever is able to buy more bitcoin than the speculated amount that we assume Satoshi holds then the person is such a genius or probably the next richest in the world, it's not debatable if bitcoin can hit a million price.
It is safe to say that Satoshi will surpass anyone in terms of Bitcoin ownership, So in this case the OP may have forgotten that Elon Musk only announced his approval of using Bitcoin for customers to patronize his business but not for investment. You are right that Michael Saylor is a true Bitcoiner, but he is not a financially powerful person like Musk. It is true that if Elon Musk had used a larger portion of his wealth for investment purposes, he might have owned more Bitcoin than Satoshi. Maybe it's better not to argue about this because this Bitcoin guy may have more wallets where he owns a much larger amount of Bitcoin.