Perhaps this gentleman has decided to cash out his winnings and was testing out the trading venue? A 10-fold rate of return in under 2 years must make it tempting to grab the bird in the hand. Still, the market is liquid enough that I think it could be absorbed with minimal price damage if disposed properly over several weeks.
https://bitcointalksearch.org/topic/buying-200k-btc-2btc-5613
Topic: 210'000 BTC Wall (Read 1065 times)
I've removed it, you can proceed with your rally now. 
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