Well if he is indeed still on the forum with another account it would be an old account most likely and that account would have a really good knowledge about bitcoins and technical details, not many people fit that description so...
I think we have to consider him very clever. So a quick profiling like that he is likely to easily evade. He could have made new accounts many times since then, and noone is forcing him to show off his knowledge in here. I doubt we will be able to detect him like that.
If he makes a new account every year, he could be anyone of us. And that is ok. Remember, his disappearance is a gift to the community making it our project rather than us working on his project.
