NFL.com ranks the league's top position groups for 2015

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1) Dallas Cowboys' offensive line

When the Joneses decided to invest top draft picks on the O-line, they reversed the fortunes of the franchise -- giving Jason Garrett the option of relying on a physical, run-first approach to knock off heavyweights around the NFL. With three first-round picks (Tyron Smith, Travis Frederick and Zack Martin) and a pair of blue-collar blockers (Ronald Leary and Doug Free), Dallas' starting quintet pummeled defenders at the point of attack in 2014, allowing DeMarco Murray to lead the NFL in rushing. The unit could be even better in 2015 with talented rookie La'el Collins possibly joining the starting lineup at left guard. The undrafted free-agent signee was considered a first-round talent before a police investigation on the eve of the draft torpedoed his stock. (Collins spoke to police about the shooting death of his ex-girlfriend, but he was never labeled a suspect.) Thus, the NFL's top O-line added another blue-chipper to a group that's set to dominate the game for the next decade.

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2) Buffalo Bills' defensive line

If Jim Schwartz was able to help the Bills' defensive line terrorize opponents without heavy blitzing, imagine how much chaos this D will create with blitz master Rex Ryan at the controls. Ryan's high-pressure tactics will produce more one-on-one chances for Mario Williams and Jerry Hughes on the edges, with linebackers and defensive backs joining the pass rush as fifth and sixth defenders at the point of attack. Kyle Williams and Marcell Dareus are imposing defenders on the interior with the capacity to blow up runs or disrupt passing games with frenetic playing styles. Dareus, in particular, is a dominating force -- with 28.5 sacks in four seasons, including 10 in 2014. Considering the success the Bills' front line enjoyed under Ryan protégé Mike Pettine in 2013 (the unit accounted for 41 of the Bills' AFC-high 57 sacks), the return to a hybrid scheme should keep the group playing at a high level this season.

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