Having failed to deliver a functional Special-K framework after all this time, IMO Greg is hardly in a position of force even if he poses as if it was the case. I'm calling it bluff. Why are people even listening to him at all? No one is irreplaceable. In any normal company he'd have been fired for lack of performance, not to mention putting the company's reputation in jeopardy by putting on the public place internal disputes and acting like a total jerk slinging mud publicly to the company's CEO. Sorry but I really don't see how he gets to walk away with half of investors money and create his own company with it.
I'm also puzzled about why would Synereo would want to use R-chain and finds itself in a unidirectional relationship where it would be entirely dependant on Greg's good will and effective (so far unproven) ability to actually deliver on his promise this time around on time and budget.
With the kind of money Greg is asking, why not go directly with a real blockchain company? I'm sure companies like Consensys, Cryptonomex or Eris would be very happy to take the challenge, and they can even hire Greg if they think they would be able to manage him. Plus Synereo would get to keep the intellectual property of the framework it contracted them to develop.
And even going fully Greg's (alleged) vision of "giving the technology to the world", a new framework and entity don't even make sense. Greg has been working with the Ethereum Foundation on Casper. Casper is all about scalability. If Synereo is to turn philantropic and spend its investor money on furthering technology for the common good, then the right thing to do is to donate the money to the Ethereum Fundation and have them add the features we need in Casper / Ethereum 2.0 or even create a completely new fork of Ethereum with functional capabilities. I'm sure Vitalik would be glad to oblige. And unlike Greg, the Ethereum Fundation has a track record of delivering on its promises. Hell, they even manage to work with Greg!
Dor, don't rush a deal with Greg. He is bluffing. With USD 4M+ in hand, you have many more options than him.