The problem with Bitcoin Cash is that they have a very small share in the bitcoin mining, so they can't do much and will be an altcoin. The "correctness" on the tech side is difficult to say, you can have different ways to perform the same thing.
They point of a coordinated event is for the miners to agree to switch to bitcoin cash at the same time (or following the same starting point). You can't use past mining power history as an indicator of future mining power history. Tomorrow (today for some) miners are making the decision to devote their mining power to the new currency, thus giving it majority share and the power it needs to be "the longest chain".
What's the interests for most miners to switch? I don't see any. The main bitcoin will continue to dominate, any side fork will not be significant at all.