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Every coin the thefts have withdrawn from Mt.Gox was somehow doubled in the past.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 ?
Its more like x% of the coins traded are gone = x% price rise.

I don't know, but the price is extraordinary strong in the light of the current events.