Not quite sure how you worked this out. If 6% of coins were stolen from Gox, they're still very much in circulation. If Gox lost the keys, then you'd be correct.
Depends on what happened to that 6%. I suspect those coins have already left Gox and either were sold on other exchanges or put into long term storage. However, because the market as a whole considered those coins on Gox to be legit up until a week ago, they had been artificially dampening prices, and by much more than 6%. For example, another $10M going into the market would move prices upwards more than they would before because of Mt. Gox. I don't know what the numbers are for coins theoretically available on other exchanges, but I'm guessing none of them were that high.