Well, I can't see any incentive for Brian or any other former member to say anything. 

First, one never knows what the future holds, so Brian has probably been advised not to say anything damaging because he could probably wind up on another show down the road.  Even if not a show, there is still radio, personal appearances, seminars, maybe even a book.  Like it or not, he is a "paranormal celebrity."  Saying anything against it would only damage future earning potential.

Second, does he state whether or not he's still under contract?  If so, the non-disclosure agreement would still be valid.  Who wants to be sued?

Lastly, well…this one is tricky.  No matter what your personal view of the paranormal is, I think we can agree for arguments sake that they are the two camps of "believers" and "skeptics."  Yes, yes…I know…you can be both.  I don't wish to start a war over this.  My point is that Brian is a believer.  He believes in ghosts.  Since being on both GH/GHI, I'm sure he's sick of being "attacked."  There is no way he would ever say anything that would "hurt" his cause.  If he saw something being hoaxed, if he thought something was hoaxed, or even if he did some hoaxing himself, he would never in a million years admit it.  The battle lines have been drawn.  He believes what he believes and is very defensive about it.  He would never give anything to "the enemy."  He's passionate about what he does and he would never do anything to betray it.

So…nope, we're not getting anything out of Brian.  No way, no how…