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Editor’s note: This is the 12th installment in Bleacher Report’s NFL 1000 for the 2013 season. This signature series runs through April 24, with NFL Draft Lead Writer Matt Miller ranking the best players at every position. You can read more about the series in this introductory article. See the NFL 1000 page for more rankings.

The NFL has become a league built around quarterbacks and defenses that can rattle those same passers. With the emphasis on passing and pass rushing, a great defensive end can be a total game-changer for both sides of the ball. That’s especially true in a 4-3 defense.

So who is the best of the best?

That’s what the NFL 1000 aims to identify. Throw out the narratives and the fantasy football stats, and dig into the film. Then we’ll see who is the best.

The B/R 1000 metric is based on scouting each player and grading the key criteria for each position. The criteria are weighted according to importance on a 100-point scale.

Potential is not taken into consideration, nor are career accomplishments.

Defensive ends in a 4-3 defense are judged on run defense (40 points), pass-rush skills (60) and all of the technique, athletic ability and football intelligence needed to play the position.

In the case of ties, our team asked, “Which player would I rather have on my team?” and set the rankings accordingly.

Subjective? Yes. But ties are no fun.

Each player was scouted by me and a team of experienced evaluators with these key criteria in mind. The following scouting reports and grades are the work of months of film study from our team.

Don’t see your favorite player listed here? Check the scheme.

With so many defenses now playing a hybrid front, we went with the players listed by Pro Football Focus as 3-4 or 4-3 players.

All statistics from Pro Football Focus (subscription required). Players’ heights, weights and seasons from NFL.com.