Ever wonder why when there's a dump, all exchanges are suffering the same fate? It's because whales spread out their coins in every exchange they can.
And I guess they are not doing it by themselves but used middleman to do their transactions. I read that some hedge manager are doing it and because whalers want to be anonymous as well. And mostly Coinbase, Bitfinex and Kraken if they are stateside, while in China Okcoin and Huobi. Yeah, I agree their investment is spread across the main exchange so that you will see a dump in almost the big one if the whalers or group of whalers decided to sell their coins.
What you said is the correct answer for the OP question, because we dont know that who is whales or big traders it may be the friendly user who you are chatting because they dont disclose their identity, they just trade between us only when needed they trade high transaction if not they also do trade in small but multi trades so that market should not get affected.
Agree with you most of us here are dont really know each other we are in a private identity that no one can ever know who this user is. So for where player trade i have read too some information about that and your right that was some information that i have read too.