I think the seeds of OB giving it away started just after that press conference when he said the Knights fans booing don't know Rugby League.
That was out of character for him, and I think that came from frustration. Frustration around the results, not having what it takes to turn them around and just feeling he has no answers anymore, he has given all he has to offer.
I think prior to that he has always had belief in the direction he was going with the club, and could redeem things. But that Booing has to have affected him, especially as the reality was the fans were not booing the team, but the coach. And the booing persisted each home game after. Even last game, old boys day, there were some boos enough you could hear it around the ground when his name was announced.
From there I think he has been thinking about giving it away this season.
I've wanted him gone for quite a long while now, I think Billy is right, he started well, quickly found his limits and we kept him a few years too long in the end.