Sure, their defensive line wreaks havoc on the opposition, racking up 37 sacks this season. Sure, their linebacker corps is the best it has been in Tony Dungy's tenure. But if you ask people within the Colts organization what the biggest difference is in their defense this year, they'll tell you it's Bob Sanders and Mike Doss, their young safety duo.
The biggest impact they've made has been in run support. They both fly to the ball and can tackle extremely well in the open field. The most unusual thing about them, though, is their size. Typical run-stuffing safeties are bigger bodies, like Donovin Darius (6-foot-1, 225 pounds) and Roy Williams (6-0, 226), but these guys are relatively small. Doss is only 5-10, 207, and Sanders is only 5-8 and 206.