They said Big Whales can control price of Bitcoin and can manipulate the price of Bitcoin, but i think no one can prove that, if they invest a lot of bitcoin they can't manipulate also because many people have also bitcoin in their wallet. Whether they control it or not just go with the flow, when Bitcoin rise sell it and if Bitcoin goes down, buy it too.
- It is hard to prove this but sometimes looking at some unusual changes is enough to make us doubt control, Bitcoin is probably in many people's wallets but they are not groups of consensus, they are just individuals who like to independently make money in the crypto market, they may even be the proponents of the whale group. Whales are unified organizations of opinion, they make a strong impact on the market, independent players stick to this idea, it's too normal to control the price of bitcoin as these mobs have tacitly understood each other