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The offensive line is horrible.
The exception to that has been Anthony Castonzo. He was drafted to be a franchise left tackle, and in his second year, he's looked like he can be just that. He handled Julius Peppers extremely well, has proven to be the only guy they can run behind and has become the cornerstone around which Ryan Grigson must build the rest of the offensive line.
The real surprise is the run game. Behind Castonzo and the left side of the line, the Colts have rushed for eight first downs and only three times have they given up negative yardage. The right side of the line has only managed three first downs, but have five rushes for negative yards.
Castonzo anchors the offensive line and provides the only spark in the run game. It's critical the coaching staff finds more help. Until they do, they need to run behind Castonzo and pray he stays healthy throughout the season.