BCH is down the most because it went up the most on the Coinex fake news email. Not surprised this dump happened.
The coinex mail was about a BSV/BCH fork.
That was not positive news... I think BCH went up because of the stress test hype.
But of course it doesn't matter what we think anyway :)
It was positive news in the fact that people thought they were getting free coins. Everybody always buys in for free coins..