Why should they dump? That person that stole all those ETH coins didn't impact the price...
Are you sure about that?

A logical fallacy perhaps. Imagine two scenarios:
#1: 3,559,374 Ethereums were stolen. Price of Ethereum June 14, 2017: $366 (today's price)
#2:
No Ethereums were stolen. Price of Ethereum June 14, 2017: $549
By the way, the stolen Ethereums amounted to less than 4% of all ETH.
ok... so who is saying that those 20 B KARMA coins that were stolen are now not in investors hands... so no need to think of those coins as stolen as they are maybe already dumped... so you can go ahead with a fair swap on Yobit so that we know that it is 100% safe...