For the BCH, time will tell for it, because according to the forum's news, the split has not yet occurred, so we should still wait for a little time to know what happens to the BCH.
If you are saying that split has not yet occured, which means no one can hold BitcoinCash..But where does this trading volume comes from?
https://bittrex.com/Market/Index?MarketName=BTC-BCC