Parnell was a member of that stellar Cowboys' offensive line, a line that almost singlehandedly helped revive the legendary franchise in 2014. Even better, Parnell only saw 388 snaps, so his body was not beaten completely to a pulp as he enters free agency. The young tackle is one of Pro Football Focus' highest-rated FA offensive tackles. Any competent, skilled o-lineman would be a good addition to the Vikings. And Parnell is a guy who fits that description. What's more, he likely can be grabbed at a relative bargain allowing the team more financial flexiblity to get players to plug up more pressing needs (most notably WR), while still improving the roster.
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Demaryius Thomas (Denver, WR)
Thomas has been one of Peyton Manning's favorite targets on offense, and for good reason. The 27-year-old WR is big, strong, and blessed with brilliant hands. Thomas is one of the highest-rated FA wideouts on Pro Football Focus, and given the Vikings' offensive woes in 2014 he'd be a perfect target for young Teddy Bridgewater. He may command some money, but it would be worth the cost as the young receiver has had at least 1,400 receiving yards, 92 receptions, and 10 touchdowns in each of the last three seasons.
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King Dunlap (San Diego, OT)
Dunlap has been an anchor for the Chargers' offensive line the past three years. He's not even 30 years old yet, and his experience facing some of his division's elite pass rushers — Kansas City's Tamba Hali and Justin Houston, Denver's DeMarcus Ware and Von Miller — is invaluable. Dunlap will be more than prepared to face the mixed bag of pass rushers he'd face in the NFC North.
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Randall Cobb (Green Bay, WR)
Cobb is a player every NFC North fanbase is familiar with. The Packers' ace receiver has been a big target for Aaron Rodgers and has broken the hearts of Bears, Lions and, of course, Vikings fans for some time now. How sweet it would be to snatch away Cobb, not yet 25, from the hated Packers and watch him burn Green Bay's defenders the way he's done it to Minnesota's DBs. Cobb had a career year in 2014, and his ability to play out of the backfield as well as in the passing game is such a weapon for any offense. Like Demaryius Thomas, he'll command a hefty prce tag, but he's more than worth it. And a creative play-caller like Norv Turner should be able to utlilize him beautifully in the offense.
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Daniel Thomas (Miami, RB)
Thomas is a relatively young RB, and can help fill any void a departing Adrian Peterson might leave. Even if Peterson doesn't look to force his way out, Thomas could fill in perfectly for Matt Asiata as a third- or second-option back. Thomas is among PFF's highest-rated free-agent backs but also should be a relative bargain among all the FA RBs. Thomas has not been utlized too much in his time as a Dolphin, but he's only asked to be a complementary back. He'd be a perfect depth addition to a backfield that could use it.
Clint Boling (Cincinnati, G)
Boling is a young player, and despite his youth he played more than 1,080 snaps in 2014. He opened up several holes for the Bengals' great backs like Giovani Bernard and Jeremy Hill. Boling also helped his fellow offensive linemen protect their QB Andy Dalton pretty well in 2014 as well. Boling is just entering his physical and mental prime as a player, and he'd make an outstanding addition to a Vikings' o-line that needs some quality and depth.
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Justin Durant (Dallas, LB)
Durant is a physical backer who posseses good speed and is an adept tackler; after all he has 410 career tackles since his rookie year in 2007. Durant was a bit inconsistent in 2014, but he is a real talent, and in Mike Zimmer's defensive system his physical abilities can be put to good use. There are not a lot of great free-agent linebackers in this year's FA class, and Durant is a player who can be acquired without too much effort and revived under Zimmer.
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Nate Irving (Denver, LB)
Irving is young, but in just four years as a pro he's already played in a Super Bowl, played in 15 or 16 games every season of his career outside of the 2014 season and most importantly he's started 12 games total the past two years. Denver has been pretty good against the run the past two seasons, and Irving was entrusted to be a starter alongside Von Miller in that time. Irving's youth is also great because he's still a ball of clay that Zimmer can mold. Irving should be a relative bargain, and adding his big body to Minnesota's LB corps can only improve the unit as a whole.