Depends very much on the sum of $$$ that they need. I think that is their strategy right now, trying to buy cheap coins and selling them on other exchanges. They can't do this with large sums at a time so they need time to do this. I bet we will be in limbo for months until Gox either quits or reborns.
I think they are doing it with large enough sums, not to mention that they could use those frozen BTC in the gox from the moment they were frozen.