Let's not forget he was the only person with the skill set needed to review new projects that took the time to do so so that the rest of us had any idea what we were getting into.
Board lost more with him leaving than if 99% of the rest bailed. There are a handful of people here that will push progress in this arena the rest of us are here to profit and improve our lifestyles if possible.
Sure he was up and down and I realised he does have a slight issue in dealing with normal people. I think it is a lack of patience and frutration that others don't automatically get things straight away that he says.
Overall very useful person lost. No point talking about it really, when and if he wants to come back I'm sure he will. YOu can ban a username and ip but not a person. If he is not back he simply does not want to be back as yet.
If anyone one person can design a bitcoin killer I would have thought he is one of the handful that could have a chance. Time will tell.