Most improved units: AFC

With the NFL draft and the better portion of free agency behind us, most teams have made their biggest moves to improve their rosters for the 2012 season. Looking at the additions so far, I see several units that have been improved this offseason. On Thursday, I examined those units in the NFC. Today, let's take a look at the AFC, focusing on the upgrades by the Pittsburgh Steelers, Buffalo Bills and Indianapolis Colts.

Pittsburgh Steelers
Unit: Offensive line

To see which AFC teams should be vastly improved in 2012, plus to get all of Insider's NFL content, sign up to be an ESPN Insider.

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Gary Horton

Scouts Inc.

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Gary Horton spent 10 years in the NFL as a scout and another 10 years at the college level as an assistant coach and recruiter. He is the founder and most seasoned member of the Scouts Inc. staff, and his extensive experience at all levels of football make him an excellent talent evaluator.