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The Bears defense has some concerns. Anthony Adams, Pisa Tinoisamoa, Nick Roach and Danieal Manning are all free agents.
In fact, the Bears currently have only two linebackers under contract—Urlacher and Briggs.
Adams might be the most under-rated DT in football, and losing him would hurt the Bears run defense in a big way.
And Danieal Manning is almost as over-looked as Adams is. It is no coincidence that from 2007 to 2009, the Bears had serious issues with the safety spot.
The safety tandem that started the Super Bowl for Chicago in the 2006 season was Danieal Manning and Chris Harris. But Lovie Smith had eyes on Adam Archuleta, who played for him in St Louis, and traded Chris Harris to Carolina for a draft pick that would become Zach Bowman.
Meanwhile, the Bears secondary had so many holes and Danieal Manning was so versatile that the Bears moved him to literally every position in the secondary over the next three years. This severely hampered his development.
But three years and many wasted draft picks later, the Bears traded LB Jamar Williams to Carolina in order to return Harris home and correct their mistake. The outcome was a return to the Super Bowl safety tandem and a marked increase in the efficiency of the unit.
Now, the Bears seem ready to watch Manning walk away in favor of a competition between 2009 third-round pick Major Wright and 2010 third-round pick Chris Conte.
Add in the uncertainty at the strong side linebacker spot, and what you get is a big question mark for a defense that was fourth in the league in scoring, third in the league in quarterback rating allowed and first in the league in passing touchdown percentage.
Yet there are still plenty of reasons to be excited. Urlacher looked better last season than he had in years, Lance Briggs is still the best in the league at what he does. And Julius Peppers is arguably the best and most complete defensive end in football.
There's still tons of talent beyond them, too. Charles "Peanut" Tillman is absolutely the ideal type of corner for the Bears defensive scheme. Chris Harris was as clutch as they come in his return to the Bears in 2010. Israel Idonije was fantastic opposite Peppers last year. Henry Melton and Corey Wootten showed youthful promise.
It will be interesting to watch what the Bears defense does to try and repeat their success from 2010.