I dont think GPU's can account for extra 25TH....
Well all I am concerned about is them dumping those coins before they ship out next batch.
Also with both batches assembled could they not do 51% attack?
Technically if they wanted they could try a 51% attack. But to what end? Double send 2 BTC to somebody? What recipient would not wait for 6 confirmations and notice a fork when dealing with a large amount of coins?
I think people oversimplify the ends of a 51% attack.