I hhve to say I was a tad shocked to hear this number, though I expected them to be high, but ESPN has ranked the Chicago Bears defensive back as the 2nd best in the league.
The Bears were very effective last season stopping opposing offenses on third down. They have three very solid corners who can matchup on the outside versus multiple spread offenses. Starting CB Charles Tillman is a physical corner who plays with good awareness and instincts in the Bears' Tampa-2 system. Right cornerback Nathan Vasher lacks Tillman's size, but is very effective in playing the ball downfield. No. 3 Ricky Manning Jr. also plays bigger than his size and was very effective in the Bears' sub defensive packages. When healthy, SS Mike Brown is a very underrated player. Also, the Bears added Adam Archuleta due to the health concerns surrounding Brown. Archuleta is a favorite of Lovie Smith and will compete for the starting SS position. FS Danieal Manning has very good speed and extended range in deep zones.
I am a little surprised the Broncos are ranked under us if you go by ESPN's drooling over what they did this off season at that position.