multi-part answer. (I know you asked Gray, not me, but I'll chime in anyway). 1) You're thinking of the Colts D as our D from last year, which was one of the most over-achieving defenses in league history. The whole was much greater than the sum of its parts. Now, with a few losses (especially Thornton) that 'whole' has been disrupted. Even with everyone healthy, we don't have the defense that played so well last season. 2) We do have injury issues. Corey Simon is just as important to our run defense as Peyton Manning is to our offense. He hasn't played yet this year. He may not play against the Titans either, because it's another win-able game without him (no offense). 3) Bob Sanders hasn't played in two weeks either. He's the best player on our defense not named Dwight. 4) We are VASTLY undersized. Even Freeney is very small for his position, and he's much bigger than Robert Mathis who plays opposite him. Gilbert Gardner, our replacement for Thornton, is the skinniest linebacker in the NFL, and he's not very good. Raheem Brock is starting at D tackle, and he's a defensive end. 5) We have secondary issues. Nick Harper is our best corner, and he's hurt. Marlin Jackson, our 1st rd pick last year, is hurt too. Antoine Bethea, a 6th rd pick this year, is starting at safety with Mike Doss, who amazingly lost his starting job to Bethea! Basically, personnel-wise, we're one of the worst defensive units in the league this year. We still over-achieve, but we're hurtin. This will change when Simon, Sanders, Harper, and Marlin are healthy.