Whenever there are dumps, whether by Mt gox or whales, there's a big opportunity for people to buy some bitcoin at a reduced price. Grab more while it lasts because even if it's true that Mt gox are dumping btc, they can't keep dumping forever. They had some btc when the price hit 20K. Btc will still rise.
Instead of thinking those dumps as a negative thing, i agree that we should treat those dumps as a big opportunity for us to get a lot of good cheap bitcoins in the market because it is the best thing to have as an investor is to have an opportunity to get a lot of cryptocurrency at a very cheap price because of the dump of the whales.