I had 1-minute charts open for OKCoin, Finex and Stamp, and the latter two definitely followed. Not saying OKCoin necessarily led, but it definitely looked to me like BTC/CNY leading BTC/USD.
It's ridiculous to follow the Chinese exchanges with their tiny walls. Of course the NLC team is going to dump its two coins there and drop the price by ten dollars. How does it work, really?
It's useful if you get a few seconds/minutes advance notice of what's about to happen over on Finex and Stamp...
I don't have the guts to trade BTC-proper - I know from bitter experience that I'm part of the reason exchange owners make money - but I do occasionally dabble with options. Yesterday I had enough time to take out a long straddle at 280 (profit if BTC/USD went beyond ~290, profit if it dropped below ~270) before the USD exchanges properly reacted. I didn't get a chance to repeat the trick at 270, because that time round the CNY exchanges gave no early indication.