I've been writing about Poloniex for a little bit now.... Like 1 month, LOL. This looks like a coordinated attack against them and others who rehypothecate their deposits into creative financial instruments. Poloniex and Coinbase and all the others who refuse to honor Bitcoin-Cash will die, and it (very speculatively) looks like it could have been a coordinated effort to kill off a certain segment of the Bitcoin exchanges. They people who knew about the BTC-Cash initiative most certainly got all their ducks in a row and made sure that they had only 1 claim to each 1 BTC that they managed. Poloniex might have been caught totally off guard. If this is so, it was a masterful move by the BCC folks.