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Per ESPN, the Cowboys were tied for 20th in the league with 34 sacks on the season. Now this may not indicate much, since the Atlanta Falcons were ranked 28h, but regardless it needs improvement.
With the Cowboys' signing of defensive coordinator Monte Kiffin, the team will be switching to a Tampa-2 defensive scheme.
How will the current roster fit in this scheme, specifically the D-Line?
One of the most important elements in running a successful Tampa-2 defense is the ability of linemen getting pressure on the quarterback without blitzing. Big, fast and physical linemen are needed to execute this scheme.
Jay Ratliff or Jason Hatcher would be an ideal linemen to lineup over the center. DeMarcus Ware would still rush on the weak side of the line, as he is the team's best pass rusher. The Cowboys will likely let Anthony Spencer walk, though it pains me to admit this. He is a perfect fit for a 3-4 schematic defense.
The linebackers are set with Bruce Carter, Sean Lee and possibly Dan Connor, who should be able to attack the quarterback when blitzing.
In conclusion, the 'Boys need to hit the draft or free agent market for physical pass rushers to complete the line.