If I understand this correctly, the only "missing link" that would definitely prove Zhou to be guilty is the transfer from the LR account the hacker used to withdraw from Aurum to the LR account Zhou used the next day to deposit in Aurum and request the wire.

The only entity which can provide such information with authority is Liberty Reserve itself.
AurumExchange, MtGox and Bitinstant, please, try to contact Liberty Reserve, in an official manner. If they don't respond, try to reach them via lawyers or something. I know it's possible that they'll just ignore the requests, but you'll never be sure if you don't try.

Zhou Thong, if you are innocent as you claim, I guess the best take for you is to abandon your financial privacy and make it clear, at least for the 3 exchanges above, where did the funds come from, and where they were going to. If you can prove a clean source for this money, I guess your fine. Everybody knows you're rich, so you having such money is reasonable. It is just that there are so many coincidences in place that's perfectly natural everyone to be suspicious of you.