Mt Gox selling coins has never been the reason for price drop so that their stop turns the market into bullish, market has been able to easily absorb the amount without changing anything. in fact the sale started right in the middle of the rise when price was around $4k-$5k and ATH happened while they were selling.
just like any other FUD this will also be replaced by another new one.
But what happened? Was there another exchange hack or another FUD?
i think it is because of the altcoin dumps.
this is just a guess at this point but it is based on two main facts:
1. the drops started wit the big altcoins before they continued with bitcoin
2. the final drops have been much bigger in altcoins than they have been in bitcoin.
and most of the money at least exists through bitcoin.