In 2001, Roy Williams was considered the best Defensive Back in the college ranks.  Playing for Oklahoma, Williams helped them the Sooners win the National Championship the year before, and in '01, he was an All-American, who won the Bronko Nagurski Trophy, Jim Thorpe Award and Big 12 Defensive Player of the Year.  The Cowboys coveted him and would trade up to obtain him with the eighth overall pick in the '01 draft.  

You always hear about the brilliance of Dallas Cowboy scouting (see Brandt, Gil), and likely that is how Calvin Hill was drafted in the first round out of Yale in 1969.  The Ivy League wasn’t, and isn’t known for producing high-end offensive talent, but that is what the Cowboys got in Hill.

Flozell Adams played for the Dallas Cowboys for the first 12 years of his 13-year career, where he might be one of the most underrated Offensive Linemen in franchise history.

Charlie Waters played his entire career with the Dallas Cowboys, but while he played in every game in his first three years (1970-72), the product of Clemson was considered inconsistent.  He moved to Cornerback the next two seasons, but he found his true calling when he moved to Strong Safety in 1975.