Both of his known accounts have gone quiet. Could this be the time he has decided to leave the forum (hopefully for good) but without making another announcement?
Usually such trolls don't just leave the forum. I am pretty sure there is some Alt somewhere trying to keep a low profile so that they can't be detected. There was some other troll who about a month or two ago announced that he was leaving the forum for good, only to turn up with another stupid Alt account and most people haven't noticed it yet 
Some of them have mental challenges. It's why I don't bother so much with them.