Question on Crypto and over the counter trades

Does anyone know for certain whether or not if whales buy OTC that it does not affect the market price as it's not bought off of the exchange it's self?

I guess I'm' wondering if it's possible that many coins can be bought up, OTC, by the whales and such to where they could purchase millions of dollars of a coin, but not affect the price reflected on the exchange.

And, are the metrics people reference about coins in circulation, or daily volume etc., taking into account sales that are done over the counter?

Just trying to sort out the ways in which the rich people do things undercover, so to speak, to where the general population aren't privy to it.

There's info that indicates that whales are buying the dips, etc, but the prices continue to go sideways or even lower.

If whales are buying the dips by the boat loads then I'm trying to understand why the price doesn't go back or or at least stablize.

Thanks for your comments!