In my opinoin, the Colts have two big problems on their defnese, and this is why teams have an easy time rushing against them,more specifically up the middle.
Their small DTs (with the exception of McFarland, and even he often gets blocked man-to-man) can be blocked man-to-man. I've seen plays where teams don't even have to team block the Colts DTs. Therefore the OLs are all over the LBs.
The Colts LBs generally have been trying to cut around O-Lineman instead of hitting and shedding, and even when the Lbs try to hit and shed, it hasn't been working. For a small LB, the cutting and knifing behind OL is not a bad idea. However, when done on a steady diet, it becomes quite easy to pick up.
There are two ways I can see the Colts fixing this problem
A. Bring an extra man into the box.
B. Have the LBs work on shedding. However, I don't think this can be changed in a week, so I think the Colts are going to have to start playing 8 in the box. Maybe go to a 4-4 on running downs?