The have fielded the NFL's No. 1-ranked defense in . But during the offseason, the 'Hawks lost defensive coordinator Dan Quinn (now the head coach in Atlanta) as well as key contributors like and . And the unit is still waiting for its dynamic safety duo to hit the field in game action: is rehabbing from offseason shoulder surgery, while is holding out.Now, obviously, Seattle's defense still could -- and should -- be one of the NFL's best in 2015. But it's plausible to think somebody could knock the off their No. 1 perch in total D. Looking acro s the league, which team has the unit to challenge Alex Ovechkin Jersey Seattle's reign of defensive terror in 2015? The have a very good chance at fielding the top defense in the NFL, especially if they tighten up some things against the run. That should be plausible, considering the lack of star power at running back on the rosters of their AFC East foes. Buffalo also will be playing an offensive scheme designed to keep the ball away from opponents -- which, in theory, will keep the D fresh. Look at what happened in Dallas last season. Buffalo's front four is as good as it gets in the NFL. This quartet gets after the QB and, in the proce s, forces fumbles. That's huge. And don't forget: Veteran DE/DT is now in the rotation, and he's a solid player and leader. The linebackers and guys in the secondary will be very aggre sive, which will leave them vulnerable, but it also puts them in position to make plays. The were one of the top teams in terms of forcing turnovers last season, and that should not change. A couple of sleeper defenses that should be in Washington Capitals Jersey the mix for the No. 1 spot, along with the and : The , , , and . Oh, and I do not think that the ' unit is just going to fall apart without , either. I'll give you two teams with under-the-radar defenses to challenge Seattle's group: Arizona and Houston. The ' defensive line is fantastic -- never gets the respect he deserves. is fully healthy, something the game-changing, playmaking corner never was last year. And should be back to 100 percent, as he was during his rookie year (before he blew out his knee). The Honey Badger wrecks offenses with his nose for the football. Houston is so well-coached and has the game's best defensive player in . is back on the practice field, and I still believe he can reach his potential and upside. is healthy, which is huge for this unit. Lastly, the defensive backfield is improved, as the spent their first-round pick on cornerback . Seattle will be hard to beat out for a number of reasons, two of which have nothing to do with defense. They have a great running game with and and a stadium that is very hard for offenses to play in. That being said, I think two contenders who ranked highly last year might challenge Seattle. Denver, which in 2014 and is led by a new coordinator in Wade Phillips, will take on an aggre sive approach with its front seven. The have a chance to be strong against the run and get pre sure with their pa s rush, which should get a boost with the addition of first-round pick . At corner, I like and ; if improves, that will only make the team stronger at that position. My other nominee is Buffalo (fourth-best D Lars Eller Jersey in 2014). The have an outstanding and seasoned front four that can rush the pa ser and defend against the run. But how good is their secondary? Another sleeper team to look at is the , led by dynamic pa s rusher . I like Buffalo. New head coach Rex Ryan -- a defensive mastermind adept at conjuring up effective schemes -- and coordinator Dennis Thurman will get this group to outdo even last year's impre sive performance. The 2014 led the NFL with 54 sacks and posted more picks (19) than touchdown pa ses allowed (16), in addition to notching a turnover differential of plus-seven -- all stats that point to a pretty good unit. Most of the key players, including those on the -led D-line, are back in 2015, while second-round pick should add to the secondary. Finally, the defense should get a boost from both an improved offense, which should reduce the amount of time the defense is on the field by about two minutes per game, and the fact that , likely in the kinds of conditions that favor defensive play. Jaromir Jagr Jersey Look, I'm not betting against the until I see them outplayed with my own eyes. They're still the most talented and well-prepared defense in the NFL. But for the sake of this raging debate, how about the ? 's presence alone completely changes the line's ability to push the pocket and disrupt opposing pa sers. To help, the game's most dominant behemoth east of is flanked by and the perennially underrated . , meanwhile, gives you one of the AFC's top cornerbacks in a secondary that will benefit from the constant attention placed on Suh and Co. up front. "I don't have a problem saying this, but I think personally we have than we had in the No. 1 defense last year in Detroit," Suh said this week. I still see Seattle as the unit of choice, but no team added a bigger chip on defense than Miami. Suh will wreck game plans from wire to wire. The ' defense could overtake the ' unit as the NFL's top defense. Rex Ryan inherits a talented group that features the top defensive line in football. , , and can wreak havoc on opponents on traditional rushes, but Ryan's ultra-aggre sive approach will lead to more one-on-one changes, resulting in more sacks. Considering the talent in the secondary ( and ), the ' attacking style could produce more takeaways and W's in Ralph Wilson Evgeny Kuznetsov Jersey Stadium this season.