Can't imagine this happening in bitcoin, there will be so much panic including me I will panic.
Satoshi (him or them) from nowhere starts moving the bitcoins in the alleged or speculated Satoshi holdings that will be the hieght of everything in the crypto space.
Satoshi holds some bitcoin on his own but he doesn’t have control on all the other bitcoins which is why owning bitcoins is so safe. Satoshi can’t fully control the blockchain. Your coin is your own even if Satoshi made bitcoon, he can’t really sell your coin without your consent or knowledge.