sure, willy was the sole reason of the price to move
Don't mention that gox was just ten percent of the global exchange volume during that time. Or that 'willy bot' has never been proven - just 'exposed' on a blog and released at a sensitive time to impact the price as much as possible!
Nothing to do with gox being 10 percent. The problem is that most exchanges had fake volume and fake price indexed to gox either willingly (exchange fraud) or via arbitrage.
Now they switched to other exchanges or average of exchanges prices.