So big whale.... A week ago I saw lisk whale had a 2k btc sell wall, now is maidsafe whale has 1200 btc wall, they can sell proportionally for more profit, this big sell wall will scare investors. Unless he is the pumper and dumper, nobody will buy his wall. Ridiculous rich whale.

Think about this:
Who in their right mind would trust an exchange like Polo with 1200 or 2000 BTC ?
Right, precisely nobody.
So the whale is Polo itself.
No other logical explanation.
I highly doubt that. Because the logic is not true. Many whales have too much trust in exchanges. Think back: MtGox - who would have trusted that exchange with much money? Many! Same with Bitfinex and it's the same with Poloniex.
There are > 100k accounts on Poloniex, most likely about 150k or something like that. And let's say 50 guys on Polo are very rich - and some of them are stupid. And we've seen big walls also in Ethereum and Factom.
Plus: If Polo would play shady games with a total lack of subtlety they could come into trouble with the SEC. And in my opinion Poloniex is where it is because they are professionals.