Nobody seems to have a good understanding of who Satoshi is. The CEO of JP Morgan basically says that Satoshi might come back and increase the supply of bitcoin. Basically he doesn’t understand that even if he did come back, he wouldn’t be able to increase the supply.
Only way to do that would be to rewrite the code and have a hard fork which no one would run since it would cause chaos pretty much. This happened in the past with the other bitcoin fork coins but the original is the one with the most work and valid chain.
That made me laugh a little, JP Morgan is a true believer of Satoshi Nakamoto, like Jesus Christ, he will rise again. I don't know how will Satoshi even do that kind of thing, there's no way that you can sneak past the validators and create a new batch of bitcoins to be mined and forks have happened before as you've said and what happened to those forks, they're pretty much abandoned. I do believe that Satoshi is someone that's read about the financial institutions and saw that there's a lot of things that's needed to be done to dismantle the exploitative system and he's probably someone that won't back down and so he created bitcoin. @Keawe said it best, it wouldn't matter if he would sell his bitcoins, whatever's going to happen when Satoshi dumps that millions of bitcoin is something that the market can bounce back, this project of Satoshi already has it's own life and he's not going to be able to terminate it no matter.