I've thought this was happening since hearing him on Murph's show in October or so, plugging his book.........After the interview, when going to break, Murph said something like "Thanks to Bill Polian, former blah blah blah, and in the future, who knows?" in a way of saying maybe he'll be back on the Bills.
Just like I knew Byrd was gone by what Murph was saying, and other things along that line, you can pretty much bet on it.