Satoshi Nakamoto holds 1 million Bitcoin making him/her/them one of world richest individuals even if not formally recognized on rich lists. It is extremely unlikely anyone will surpass Satoshi Bitcoin holdings because their vast stash has remained untouched it would cost huge amount to buy that much Bitcoin today without affecting market and all Bitcoin transactions are public making it impossible to secretly gather such large amount. While Elon Musk is big name in crypto his personal holdings are too much low than Satoshi real contenders  like MicroStrategy investment funds like BlackRock ETFs or even governments. So in my point of view Elon will not be one of them or maybe on one.