From the rumor I read at NFL.com, I think it was, he signed for a lot less than what they were offering at camp time and the only way he gets to void the 6th year of the deal, as I understand it, is if he meets certain achievements in 2 of the first 4 years of the deal.
Well you can pretty much assure yourself he won't meet those numbers in this season. So he'll have to do it in 2 of the next 3. Depending on what they are that could be very difficult.