The Dallas Cowboys haven't made the signing of guard Uche Nwaneri official because they have to make a roster move first. Moving Sean Lee to injured reserve, thus clearing space when training camp starts, is one possibility. The Nwaneri signing means the Cowboys want to add experienced depth to an offensive line that is getting younger at its core. Four potential starters are each under 25 -- Ronald Leary, Travis Frederick, Zack Martin and Tyron Smith.
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