No, there is never least effect of whale manipulation on bitcoin among all crypto coins.
You are wrong for saying there is no least manipulation on Bitcoin. Bitcoin is not like other cryptocurrency that gets manipulated easily and this is why Bitcoin is the most dependable cryptocurrency. Bitcoin also gets manipulated but there is a difference. Manipulating Bitcoin has to be expensive therefore not every whale will want to do that but there are some that tries and do not succeed. I saw a news that an address that mined Bitcoin during the days of Satoshi still being active just move some Bitcoin from the address for the first time, what this news means is the whale is thinking of selling his Bitcoin and this can create panic among other retail investors and they begin to sell causing the price of Bitcoin to fall, this is manipulation because they have cause a reaction that is making people to want to sell.
To be fair, none of us have any concrete evidence that the market is being manipulated because no one is stupid enough to publicly admit that they are manipulating the market. But with what has been happening, we can see that bitcoin is very sensitive to news, just a small news like you mentioned is enough to make the market fluctuate. If that's not a sign of manipulation, then what is?
It would be naive to think that bitcoin has become so big that it cannot be manipulated, bitcoin is just bigger than altcoins, it is not as big as we think. It is nothing compared to other financial markets like gold, stocks, forex.
Just one negative news can cause the stock market to evaporate trillions of dollars, and that number is many times larger than the total capitalization of bitcoin and the total capitalization of the cryptocurrency market. That shows how small bitcoin is.
https://www.straitstimes.com/business/85-trillion-wiped-out-from-global-stock-markets-but-are-recession-fears-premature