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Cowboys, Redskins, Dolphins top most improved defensive lines

As we head into the 2015 NFL campaign, Bucky Brooks is identifying which teams have improved the most in particular position groupings since the end of last season. Today's focus: defensive lines.

5) Cleveland Browns

It is hard to believe the Browns fielded the NFL's ninth-ranked scoring defense despite surrendering a league-worst 141.6 rushing yards per game in 2014. The lack of available players along the defensive line robbed Mike Pettine of what he absolutely needs in his aggressive scheme: active, big bodies to control the line of scrimmage. While the healthy returns of Phil Taylor and John Hughes should shore up some of the issues at the point of attack, it is the arrival of first-round pick Danny Shelton that could help the Browns' D-line dominate opponents. The 6-foot-2, 339-pound rookie is an active defensive tackle with a unique combination of size, strength and athleticism that should create problems for opposing offenses. Shelton's presence in the middle should command double teams from foes, leading to one-on-one opportunities for the rest of the Browns' front-line players.

The Browns also added a pair of pass rushers (Nate Orchard on the outside, Xavier Cooper on the inside) on Day 2 of the draft to further enhance a front that generated just 31 sacks a season ago (ranking 27th in the league). Each player has flashed in the preseason (Cooper has three sacks in two games); they could make key contributions as situational playmakers as rookies. While it is tough to count on several first-year players to make an immediate impact, Cleveland's ultra-aggressive scheme could allow the rookies to make their mark from Week 1.

4) Houston Texans

The spectacular play of J.J. Watt spearheaded the Texans' defense a season ago, but the 2014 Defensive Player of the Year needs more production from his supporting cast for the unit to spearhead a playoff run. Watt accounted for 20.5 of the Texans' 38 sacks while also delivering numerous splash plays against the run that helped the D get off the field in critical situations. While it is possible that the perennial Pro Bowler could replicate that effort in 2015, Houston's defense could rise to prominence behind the arrival of Vince Wilfork and the return of Jadeveon Clowney. Granted, Wilfork is no longer the destructive force that terrorized opponents during his prime, but the big-bodied run stuffer still commands a double team at the point of attack and creates opportunities for active linebackers to flow freely to the ball. Given Brian Cushing's instincts, awareness and athleticism, Wilfork's presence will allow the active 'backer to control the tackle-to-tackle box as the unit's designated playmaker.

Meanwhile, Clowney is on track to return to the lineup following his lengthy recovery from microfracture surgery on his right knee. Last year's No. 1 overall pick is a natural pass rusher with extraordinary physical tools. Although critics question his motor and effort, there is no disputing his freakish athleticism and instincts as an edge rusher. If he can regain his pre-injury form, Clowney could give the Texans the book-end rusher needed to dominate in a pass-happy league.

3) Miami Dolphins

Whenever a defense adds arguably the most destructive defensive tackle in the NFL, the unit has an opportunity to field one of the best D-lines in the game. Thus, the Dolphins deserve a spot on this list after adding Ndamukong Suh, the crown jewel of free agency, this offseason. The sixth-year pro absolutely obliterates blocking schemes at the point of attack, creating chaos with his unique skills as a run stopper and pass rusher. Suh has 36 career sacks in five seasons (including 8.5 in 2014) and creates one-on-one opportunities for edge rushers by commanding double teams on the inside. With Cameron Wake and Olivier Vernon previously wreaking havoc off the edges without an All-Pro presence on the interior (the duo combined for 38 sacks over the past two seasons), the addition of Suh makes the Dolphins' pass rush frightening.

Miami also stands to benefit from the addition of Jordan Phillips to the rotation. The team's second-round pick is one of the most naturally gifted defensive tackles in the 2015 class, but questions about his work ethic and motor led to a slide down the charts on draft day. If he brings the effort and energy consistently, Phillips could join Suh to spark a much-improved defensive line.

2) Washington Redskins

For the Redskins to make a run at the NFC East title in 2015, the defense must find a way to control the trenches in a division loaded with elite offensive lines. To enhance their chances of holding the point, the team added Terrance Knighton in free agency. The 6-foot-3, 331-pounder affectionately known as "Pot Roast" is a dominant run stopper, exhibiting exceptional strength, power and balance controlling the line of scrimmage against double teams. Knighton's presence at the point of attack will allow Redskins linebackers to run and chase without obstruction, which should allow Washington to boast a top-10 run defense.

On the edges, the arrivals of free agent Junior Galette and rookie Preston Smith should help the Redskins generate a consistent pass rush in 2015. Galette's signing was viewed as controversial by some observers, due to his questionable off-field antics and falling out with the Saints, but there is no disputing his ability to get to the quarterback. The sixth-year pro has recorded 22 sacks over the past two seasons, displaying outstanding quickness and power off the edge. If he can stay out of trouble and quickly master the scheme, he should team with Ryan Kerrigan to give the Redskins one of the top rushing tandems in the NFC. Kerrigan thrived as the team's DPR (designated pass rusher) without assistance in 2014; he could take his game to another level with more one-on-one opportunities on the horizon.

Smith could be the wild card for Washington this year. He has intriguing physical tools, but needs to polish his technique to become a disruptive force off the edge. If he can crack the lineup as a situational rusher by midseason, the Redskins' defense could rank as one of the NFL's biggest surprises this year.

1) Dallas Cowboys

For all of the accolades hurled in the Cowboys' direction during their surprising run a season ago, the team captured the NFC East title despite fielding a defense that lacked star power along the front line. While Rod Marinelli's scheming and motivational tactics prompted a host of no-names to outplay opponents with energy and effort, the odds of duplicating that feat without upgrading personnel were slim at best. Thus explains the Cowboys' decision to gamble on a pair high-risk/high-reward edge rushers in Greg Hardy and Randy Gregory.

Hardy, in particular, is a Pro Bowl-caliber pass rusher with a knack for getting to the quarterback. He posted 26 sacks over a two-year period (2012-13) before sitting out 15 games a season ago due to his misconduct off the field. Reports about his deplorable behavior off the field certainly raise legit concerns about his character. Evaluating him strictly in a football sense, though, there are few questions about his rushing prowess as an energetic playmaker. He overpowers blockers with his brute strength, yet also displays the agility to win with quickness or finesse off the edge. With Hardy also playing with a feistiness that endears him to his teammates, the sixth-year pro could emerge as one of the leaders on the defense after serving his four-game suspension.

Gregory was universally viewed as a first-round talent for most of the pre-draft process, but then a failed drug test at the NFL Scouting Combine and some background issues plummeted his stock in April. Although he fell to the 60th overall pick, Gregory has already flashed big-time potential in Dallas and is impressing evaluators with his Simeon Rice-like traits as a pass rusher. If he quickly develops as a situational player and DeMarcus Lawrence continues to grow as a young pass rusher, the Cowboys suddenly have a deep and talented rotation that will strike fear in the hearts of quarterbacks around the NFL.

Follow Bucky Brooks on Twitter @BuckyBrooks.

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