Why would satoshi be involved in controlling the BTC price? BTC price can't be controlled by one person and Bitcoin is owned by individuals they can only manipulate the price by news or a group of people or a company with a huge money/BTC and it also depends on the trends but they will never control the price. That is why there are whales out there waiting to buy or sell and they are mostly doing some strategy that can manipulate the price a bit. About Satoshi If they know Satoshi he can't do anything about Bitcoin price the movement of the price depends on demand and supply which is controlled by people who buy and sell on exchanges.
You made the right thing of differentiating between control and manipulation. The idea of controlling is quite different from manipulating...anybody can manipulate the market in such a way that the price movement of a certain currency can go up or go down depending on what that person or organization is doing. In case a person has a bulk of BTC, he can sell and the market can be reacting to it negatively so the price go down...or one can buy a lot of BTC and the result is that there can be a spike in the price of the coin. On the other hand, the idea of control is that there is somebody who can be in charge and this is true with the government's central bank or Fed in the case of USA - with centralized power behind it all. Now, do we really have such a thing in Bitcoin? Or maybe this is just another pigment of someone's imagination who is fed up that he can't be manipulating the market himself alone?