Big Board update from Kiper

With Matt Barkley out of the NFL mix, the focus of the upcoming NFL draft shifts from quarterbacks to protecting them, says ESPN's Mel Kiper Jr. Here's a look at his latest Big Board -- which still includes three Stanford players projected in the first round.

Writes Kiper:

Notable is that regardless of where your favorite team is picking in Round 1, there's a rise in overall talent, and the diversity of that talent along the offensive line. The position group is starting to look really deep.

Per usual, quarterback Andrew Luck checks in at the No. 1 spot.

Offensive tackle Jonathan Martin slipped from No. 8 to No. 9 and guard David DeCastro leap-frogged a few players to move up from No. 17 to No. 14 this week -- marking the first time he's appeared in Kiper's top 15.