My question is after reading this thread i began to think that how Block Rock only have the potential to affect the BTC price because the OP who made that thread, first mentioned the wrongdoings of Blackrock like to create some suspense or horror in the minds then he mentioned that BlackRock has the potential to manipulate the BTC price. Because so far from what i have learnt that's not possible for single entity until a huge group of validators or miner did not make and huge whales do no decide to dump the market.
Anyone with a large enough holding can manipulate the market.
Market prices depend largely on exchanges which can be manipulated with mere hundreds of bitcoins.
The big players transact OTC in thousands or tens of thousands of coins.
They're more than happy to lose smaller amounts on exchanges in order to accumulate or liquidate much more OTC in order to realize great profits, usually Bitcoin profits.