If you're referring to BCash, then you are spot on. I'm closely monitoring the situation and have a good time reading through their internal warfare. I'm kinda certain that I will short them just before the fork takes place.
I honestly wouldn't risk any amount on shorting something that seems to be so easy and profitable to do. You know what they usually say in these cases: when things look too good to be true, they mostly are.
The only danger here is that Bitmain might pump BCash afterwards, all to attract more hashrate with an economical incentive.
That's what I believe will happen. Don't forget that Bitmain holds +1 million BCH, which basically means that they have no other choice but to pump up the price. They have to protect the value of their massive holdings.
Another point is that protecting the value of their holdings also means that regulators won't use that against them to entirely reject their IPO plans. In other words, there is a lot to lose for Bitmain.