The whales might have also sold in the all time high and buy the low.
No kidding, Sherlock.
The big boys have taken 3-way profits by selling the spot market down, shorting the crap out of it through futures, and shorting the crap out of it through BitMex.
Fundamentally speaking, whales aren't really selling their coins, they just dump their coins in their own buy orders on the way down. By the time they dumped the price to the bottom they have more coins, more fiat, and a lower price to accumulate even more coins at. That's the good life. All the noobs here are nothing more than a bunch of flies to them. What happens with flies when they become annoying? They get squashed. That's exactly what happened with weak hands and other get rich quick noobs.