that is a very strange move by the hacker! there are already many ways to exchange coins with each other and there is also mixing techniques that could be used to make it harder and even impossible to trace the coins! i am wondering why someone who were able to "hack an exchange" doesn't already know this!
was it an inside job by a dumb employee who got access to the keys?!
You got the right point mate,being a hacker of a exchange (in which not so easy job to do)it is impossible that the hacked coins will be transferred in some places that has a capabilities of freezing or even holding the amount
For me this thread is not reliable since youre correct again that they can use atleast mixing site to keep the hacked coins safer for them.this is not considerate