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LT: Anthony Castonzo
Anthony Castonzo was one of the few shining stars on the offensive line last season. He was by far the best run-blocker.
However, to be fair, he did struggle to protect Andrew Luck against the edge-rushers. His season should be greatly improved in 2013 with a new, upgraded offensive line around him.
LG: Donald Thomas
Donald Thomas is a great upgrade for the Colts. He really proved himself last season with the Patriots. He was actually graded as a top-20 guard in Pro Football Focus. He is more than ready to be a starter.
He may also be used at right guard, depending on what the Colts manage to pick up.
C: Draft: Barrett Jones
The Colts should not use A.Q Shipley or Samson Satele. Both suffered from injury and lackluster play last season.
I think that the Colts will fill this spot in the draft. I would love to see Barrett Jones from Alabama get picked up. He is spectacular as a center and his value is increased by his versatility at the offensive line. He can play several positions, which could come in handy for the Colts.
RG: Reitz or Draft
I do not want to see the Colts using Joe Reitz as their starter for the guard position again. There haven't been any new acquisitions through free agency.
Therefore, I believe that the Colts will draft someone to fill this spot.
Reitz was rated badly as both a run- and pass-blocker by Pro Football Focus, not to mention his knee and concussion issues. If no one is picked up, he will start, but he would be better as a backup.
RT: Gosder Cherilus
Cherilus has started a total of 71 games in his five-year career. However, he really stepped up last season for the Detroit Lions. He is an immediate upgrade for the Colts at the right guard position.
The only issue is that he is coming off knee surgery. If he's not healthy, he will obviously not be the Colts' starter—but he should be healthy by the season's start.