Do you even know how much trade 'Willy' did during that period compared to the global market? It was a small percentage of gox' trade and gox was a percentage of global trade. Funny, everyone after November were screaming from the rooftops that we were doomed due to China "banning" Bitcoin and the whole rally was lead by China, yet a few weeks later the same people say were doomed as it was all gox' leading. Make you mind up.
It is likely that "Willy" was just an account for high value clients that would not want a few million sitting in a customer account waiting to be hacked. Even if its not, the effect Willy had on the global market was small, if any, and its asinine to try and attribute a prediction that BTC won't go above $1000 for a long time to that.