Ok, so why did he remove it after a short while if he is a legit sell, and build up that 8000BTC bid wall....
and why didn´t he slowly sell out over all exchanges distributed.
Sorry but your explanation is highly unlikely.
There is a big possibility that he is verified only at Bitstamp (in instance I am verified only at stamp), the other possibility is him selling for the available 5KBTC and watching if anyone is prepared to buy his stash which eventually failed, and I think he did remove that Bid wall to not cause more panic.... after all, I think he still interested in selling even more, we will see how things develop when more bids build up.
If he wanted to sell, he would have called, GABI, Tim Draper, Barry Silbert, some other OTC exchange, or just dump them all in one go. But not by placing walls on a sunday!