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This is actually three players, but individual interior offensive line guys don't tend to see a lot of praise. They work as a unit, and they receive praise and criticism as a unit, usually.
In 2013, the Titans' offensive interior was made up of Andy Levitre, who had been one of the better guards in the league for years, Chance Warmack, who was considered one of the best guard prospects in recent history, and Brian Schwenke, one of the best center prospects in the 2013 draft class.
Needless to say, expectations were high, and needless to say, the players fell short of expectations. Levitre had an off season, Warmack struggled more than many thought he would (though that shouldn't have been surprising), and Schwenke only played for part of the season due to injury.
They improved as a unit toward the end of the season, and offensive lines tend to play that way. They take some time to jell.
Levitre was a great guard for several years; he's not gonna stay down long. As for Warmack and Schwenke, they'll be a year bigger, stronger and more experienced in 2014.
I expect the group to be much better next season.