The Buffalo Bills traded for Rasul Douglas midseason and it was a tremendous boost to the defense as Douglas made big plays almost on a weekly basis. In only nine games with the Bills, he had four interceptions, eight passes defended and two forced fumbles.
Doulgas is entering the final year of his contract and has a cap hit of $9 million. However, none of that is guaranteed so if the Bills were to release him, they would not incur any dead cap.
The challenge is that Douglas played so well, it makes almost no sense to release him. The team can keep him on the roster for one more year at $9 million, which is reasonable for a cornerback of his caliber.
However, with questions about Tre'Davious White, and when he might be able to return, it would make sense to extend Douglas to a longer contract. He could be the team's number one cornerback and take pressure off White or allow him to move to another position.