He's still active on twitter... that's where I follow him.
There had to be some kind of falling out. First, it was "he needs a mental health break" then the story changed a few times in the couple weeks following him leaving. A few weeks later, RJ had him on a podcast when the social media questioning gained momentum. But all that did, in my opinion, was make it worse, since RJ gave Brad about 30 seconds to speak. RJ then launched into a half hour of taking about himself and the Sopranos before Brad left. If anything, it only reinforced the suspicion that Brad had had enough, but must have also signed some non-disclosure to not talk shlt or go work for a competitor. I'll try to find the thread from back when that went down....