Don't be quick to point accusing fingers. Yes, the MTGox trustee messed up big time then, but I don't think that he might be the reason why the price of bitcoin is dipping recent. Anything could have caused it; the traders who are rushing off to sell since the price moved from 6k for 9k could have been the cause. Moreover, the recent price that dropped isn't that bad.
I am sure the MtGox sold a huge amount of coins and that reflected the market going down and if they are selling ten thousand plus coins the other sellers would panic and dump their coins fearing a correction and if they are selling the coins again, it will reflect in the price.