13. Detroit Lions: Anthony Castonzo, OT, Boston College

In an ideal draft, the Lions would be thrilled if CB Prince Amukamara was still available when they select at #13. However, with him off the board, the Lions turn to their next biggest need, which is protecting Matthew Stafford.

Anthony Castonzo is the best offensive tackle on the board. While he doesn’t have the long-term upside of Nate Solder, he is more NFL-ready and can be plugged in immediately at left tackle to protect Stafford’s blindside. Castonzo will also be a key to revitalizing the Lions' ground attack, opening holes for a hopefully healthy Jahvid Best.
 
Here’s the scouting report on Castonzo and following is the analysis of this pick, both courtesy of Eric Galko of Optimum Scouting:
 
Over the past five years, the Lions have been able to add an elite receiver (Calvin Johnson), a game-breaking running back (Jahvid Best), a franchise quarterback (Matt Stafford), and players at every level of the defense (Ndamukong Suh, Cliff Avril, DeAndre Levy, Louis Delmas). However, the only thing really missing is the offensive line, where Gosder Cherilus could be set on the right side, and Jeff Backus could be great inside at guard. Adding Castonzo could "complete" this offense and put the Lions in position to actually make a playoff run. If Prince Amukamara was here, he'd be the pick, and they could also look at impact pass rushers like Aldon Smith as well, but getting Castonzo or Tyron Smith of USC would be the smartest option for them.