The Texan's D is banged up, but I'm not overly concerned with McCain being out. He wasn't having a great year anyway. Harris looked pretty OK Sunday against the Flaming Thumbtacks and is more physical than McCain along with usually keeping tighter coverages.
Routt could be a big assett down the stretch. He was a pretty good cover CB in Oakland and he's fast. IMHO, the Chiefs asked him to do things, in a zone scheme, that he's simply not very good at. Kinda like Asomough in Philly. He went from best cover corner (unless you like Revis more) in the league to total schmuck in one season.
The loss of Cushing is the biggest blow we have to overcome, but we've been getting betterand better at the LB positions since he was injured.
Moving Barwin back to his natural position at SAM will also help. He's very atheletic, does well in open space and seems to understand the coverages better than Reed.
Having said all of that, I'm sooooo glad I don't have to see how Wade would scheme to stop Gronk. Or slow him down. Or keep him at less than 3 TD's.