It is not possible if only one person can manipulate or influence the price, for sure it is an organization, but again, those whales (if true) are good guys as they don't manipulate the price, meaning they have so much bitcoin that they can influence the price but they aren't doing it. In contrast to altcoins, once you have a large portion of it, which we can easily obtain on presale, or if it is new, the price will drop when you begin selling your coins.
Oh they do! Of course with time bitcoin holding becomes more and more decentralized and impact of whales manipulations becomes less and less, but they still do influence and get their benefits from that. I can remind you that even without big market activity Musk influenced the crypto mainly with his several statements. Combining both market games and media activity can give bigger effect. Do you really think that people who can do that, all don't use such an opportunity?