We know what we're getting with Blackburn, and I'm convinced we can get comparable production out of Klein.
That being said, one of my biggest concerns on the defensive side of the ball is the eventual retirement on Thomas Davis. He's got 2, maybe 3 years left, but after that we are going to have a major hole in the heart of our defense.
With that in mind, I think Chase's roster spot could be better served taking some flyers on mid to late round rookies over the next couple drafts. We are either going to have to find a diamond in the rough now (like Benwikere was this year) or use a high draft pick later in order to replace TD's production.