This is a hypothetical question. But what if he actually did send his Bitcoins to an exchange? Will they sky rocket past the moon, or bumble down as weed.
Bro, if that happened then it will lower the prices of the bitcoin because we will have 6% more coin in the circulation than the previous circulator. Which means though we are having bigger demand but on top of that we will have bigger supply pool so there is no rise in the prices. This is because our formula high demand low supply = $$$ won't work here. :-) It is juts reversed when Mr. Satoshi dumped his bitcoin into the circulation. But lets not this doesn't happen really.
For skyrocketing the prices of bitcoin you ask Satoshi to put big amounts of fiat into it . Lolz. Then it would be possible to spike the rates.