That's a massive oversimplification of what occurred.
Greinke simply didn't want to be traded to a team that just gutted it's roster to acquire him... going from one losing situation to another losing situation wasn't going to help him, or the Nats.
He did the team a favor.
I tend to believe that the simplest answer is the more likely. We aren't dealing with a bunch of Socrates and R.A. Dickeys here. We are dealing with jocks. Meat.
He was full of crap then and I think he is full of crap now. He wouldn't have been a fit then or now so I don't know why some fans are choking like we missed some prime opportunity. (Not saying here necessarily, but in other parts of this great Interweb.)