What I picked up from the bitcoin cash fork is that bitmain have given up trying to increase the value of bitcoin cash and have sold off the miners they used to mine it with when they wanted to control it.
I don’t have muc information on that whole fork because I’ve limited time and only found about the main parts of it yesterday (I think that means I have a life ). Although, bitmain have a large share of the hashing power, if they sold all of the mining rigs to a company like f2pool or bitfury, then more than half of bitcoin Minnetonka hashing power would be made up of that company which means they would have enough power to attempt shadowmining or other attacks on the network that could completely destroy bitcoin. Whether they’d actually do it or not is another question, but it is possible.