Any time a key insider sells a substantial portion of his/hers portfolio it will cause some alarm. Some are for legitimate reasons and some are simply a bail out. In Anderson's case, even though we can only speculate the reasons, I think it is not for bail out reasons. I am banking on the arranged buyer, who knows who the seller is, and would have done their proper DD. I am also counting on the buyer would be given the real reason for this Patrick's sale. Heck, I would have ask why if I were that buyer for sure.
Keith Barron owns much more shares than Anderson and so far he has only been selling bit and pieces here and there. Even then the basher on the other BB always play that up every time. If he sell a major chunk of his holdings, I would be the one to follow him out the door.