Hmm, good points. However, he could enforce a hardfork even with a more powerful miner out there, as hardforking only requires that the people using the coin update their software. If for example the dev says, "This is the new version" a rogue miner doesn't need to accept it, true, but if all the services and majority of users stick with the 'official' chain, then the rogue miner would solving blocks that no one else accepts.
That's the catch, he can do the hardfork .. but it will be at extreme cost of risking whatever marketcap it has managed to accumulate. I'm sure cbuchner didn't spend an awful amount of time making the software. He is clearly profiting, but the hard fork will now be done only if he consents to it .. else he could simply sell his stash and crush the market .. destroying confidence in the coin. I'm sure he doesn't have much invested in this other than a few power bills. So either he works with CZ to try and create some kind of future prosperity, or he doesn't and it gets ugly very fast.
The parties involved have left the adopters of this coin with something that may very well be valuable, but will never be theirs. I cannot accept that, it's just way too dangerous.