The Vikings quickly signed 15 undrafted free agents at the draft's conclusion, with a few big names mixed in.

NFL.com's Chase Goodbread speculated back in February that Richardson could drop due to concerns over his knees.  That seems to be the case, because "Tiny" Richardson is too big, physical and athletic to fall out of the draft otherwise.

Kain Colter, WR, Northwestern

One of the Big Ten's most dynamic players in the past few years has signed with Minnesota and will be making a full-time position change to wide receiver.

A.C. Leonard, TE, Tennessee State

Leonard has endless athletic potential, but maturity questions likely lead to his draft drop. He walked away from the Florida Gators in 2012 after pleading guilty to misdemeanor battery.

Zac Kerin, C, Toledo

Kerin started three years for the Rockets at center and showed a chippy demeanor at the East-West Shrine Game in January.

Austin Wentworth, OT/OG, Fresno State

A transition is ahead for Wentworth, who played in a quick-hitting spread offense at Fresno State.  A shift inside to guard may be imminent.

Donte Foster, WR, Ohio

Foster came on strong as a senior, but doesn't show enough special qualities to be a real factor for a roster spot.

Matt Hall, OT, Belhaven

At a listed 6'10" 325 pounds, Hall may be the most interesting of the undrafted free-agent crop for Minnesota.

Erik Lora, WR, Eastern Illinois

Lora is an undersized receiver who's production went through the roof in 2013 catching passes from Jimmy Garoppolo.

Conor Boffeli, OG, Iowa

Boffeli only started a single season on the Hawkeyes offensive line.  He looks like a long shot to make an impact in camp.

Jake Snyder, DE, Virginia

Synder started three seasons for the Cavaliers but never made a significant statistical impact, especially as a pass-rusher.

Dominique Williams, RB, Wagner

After averaging 4.4 yards per carry and scoring only six rushing touchdowns as a senior, it's tough to see Williams as an NFL back.

Isame Faciane, DT, Florida International

Minnesota's defensive line coach Andre Patterson held the same position at FIU in 2013. That gave Faciane the path to a contract.

Pierce Burton, OT, Ole Miss

Burton started two seasons at right tackles for the Rebels after transferring in from San Jose State.  Listed at 6'6", 290 pounds, he's of the lean variety.

Tyler Scott, DE, Northwestern

Scott ranks sixth all time in sacks at Northwestern with 16.  He earned a second consecutive All-Big Ten honor in 2013.

Rakim Cox, DE, Villanova

A lack of even average athleticism could doom Cox in camp.  He was a solid contributor for the Wildcats, starting for four seasons.