No, not even a little bit. Simply because bitcoin is decentralized and no single entity, no matter who they are, can ever control it.

As for the effects of Satoshi coming back, it is only going to be on the price and nothing else since people love to find some excuse to make irrational decisions in the market. The size of the impact depends on when such a hypothetical situation is going to take place. The more mature the market gets, the less the effects are going to be.