I think for the last months' someone or a group of whales from Asia are in need to sell a large portion of their positions. Could be related to new KYC requirements from the exchanges. Every big exchange have changed the rules about this.
Don't think it works like that. If whales actually want to get rid of their coins (without any intention of buying lower) they will look to get the most out of their coins as possible. There is a fiercely growing peer to peer market in Asia where large amounts can be sold to a pool of crowded buyers. I think we're in a cycle where we just have to accept the semi artificial down force created by whoever they may be. It might even be wall street trying to buy up coins at way lower levels before they strike -- they know how markets work and don't shy away from abusing their position in any market. People shouldn't sell their coins to these bastards....