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No newcomer is expected to impact the 2012 Eagles as much as DeMeco Ryans, who comes over from Houston to take over at middle linebacker.
Only the Buccaneers missed more tackles than Philadelphia did last season, according to Football Outsiders.
And while his last two years in Houston were marred by an injury and a scheme change, he's healthy now and back in a 4-3 defense.
Ryans averaged 130 tackles per season in his first four years in the league. That's good.
But there are still some concerns. He's replacing Jamar Chaney in the middle, but Ryans missed just as many tackles as Chaney last season, per Pro Football Focus.
In fact, he ranked 31st among 37 qualifying inside linebackers in tackling efficiency in 2011, 47th out of 50 in 2010 and 27th out of 39 in 2009.
Considering that he also can't be relied upon to be an asset in coverage, it's easier to understand why the Texans were willing to part with the two-time Pro Bowler in exchange for only a fourth-round pick.
I'm not saying he won't help considerably. A new environment should provide a boost, and Ryans has a chance to become a veteran leader in Philly.
His presence will be valued. But we also shouldn't expect him to single-handedly erase all of the team's problems on defense.