Just how valuable is Albert Haynesworth to Tennessee's defense? In 13 games with Haynesworth, the Titans allowed only 15 points a game, while they allowed 32 points a game in the three games he missed. (Photo by Ronald Martinez/Getty Images)

The Bears' Tommie Harris had the second-most sacks by a defensive tackle in 2007, tallying eight. He also had 36 tackles and two forced fumbles. (Photo by Jonathan Daniel/Getty Images)

New England's Ty Warren is perfect for Bill Belichick's defensive system as he can seamlessly slide from defensive end to defensive tackle depending on whether the Patriots use a 3-4 or 4-3 alignment. (Photo by Doug Benc/Getty Images)

The Steelers' Aaron Smith is going into his 10th season and has been a vital component in Pittsburgh's signature 3-4 scheme. (Photo by Jonathan Daniel/Getty Images)

The Raiders' Tommy Kelly had 68 tackles two years ago, good enough for second in the NFL by defensive tackles. He was limited to just seven games by injuries last season, but appears to be healthy again. (Photo by Win McNamee/Getty Images)

The Jaguars' John Henderson has been remarkably durable throughout his career, missing only one game. He figures to play a vital role in new defensive coordinator Gregg Williams' defensive scheme that values clogging the middle and stopping the run. (Photo by Andy Lyons/Getty Images)

The Patriots' Richard Seymour does a great job of collapsing the pocket, allowing the team's linebackers to blitz off the edge and get pressure on the quarterback. (Photo by Jim Rogash/Getty Images)

The Browns thought enough of defensive tackle Corey Williams to trade a second-round pick to the Packers for him during the offseason. (Photo by Rick Stewart/Getty Images)

When healthy, Buffalo's Marcus Stroud is one of the elite defensive tackles in the league, but he has played just 12 games in the past two seasons. (Photo by Jonathan Daniel/Getty Images)

The Chargers' Jamal Williams struggled to stay healthy in his first five seasons, missing 24 games. He has managed to stay on the field more in the past five years, however, having missed only five games since 2003. (Photo by Donald Miralle/Getty Images)

Defensive tackle Shaun Rogers will join fellow newcomer Corey Williams on the interior of a revamped Browns defensive line. Cleveland hopes the pair fortifies what was the league's 30th ranked defense. (Photo by Kevin C. Cox/Getty Images)

The 35-year-old Pat Williams has always been considered one of the best run-stuffing defensive tackles in the league. He has started every game in Minnesota since joining the Vikings in 2005. (Photo by Doug Pensinger/Getty Images)

Defensive tackles are not usually known for their pass coverage, but the athletic Kevin Williams returned two interceptions for touchdowns last season. (Photo by Harry How/Getty Images)

The Texans' Amobi Okoye is one of the youngest players in the NFL, but he has quickly developed into one of the league's fiercest linemen. (Photo by Jed Jacobsohn/Getty Images)

The Patriots' Vince Wilfork is a prototypical nose tackle in New England's 3-4 defensive alignment. (Photo by Jim Rogash/Getty Images)

Jets defensive tackle Kris Jenkins is expected to solidify the center of the line after he was acquired in the offseason from Carolina. (Photo by Jeff Zelevansky/Getty Images)