3. Calais Campbell, Jaguars
Campbell might not be a household name among NFL fans, but talk to players, coaches and scouts, and his name will come up at or near the top of every one of their lists of the best five D-lineman in the league. Last season, the Jacksonville Jaguars rewarded him with a $60-million free agent deal (including $30 million guaranteed) and made him a '40' front end of the first time — though, like in Arizona, he wreaked havoc from virtually every spot along the line. At 6-8, 282 pounds, he’s one of the biggest defensive players in the NFL, and Campbell's great length and massive wingspan make it almost impossible for blockers to get into his body.