I'm unsure whether it was menitioned before:
Every coin the thefts have withdrawn from Mt.Gox was somehow doubled in the past. It was most probably sold by the thefts _and_ it was blananced at the Gox user accounts.
So now there are a lot of people that have less bitcoins than they thought they would have a week ago.
you mean 7% of the coins "gone" = 7% price rise ?
If 7% of all bitcoins really are gone then the price rise would be more like 30% because the 7% were from the actively traded float, not from the several million hoarded and locked away in Arctic-cold storage.