The Dallas Cowboys enter the 2013 NFL Draft with needs on the offensive line, defensive line and secondary. With such a deep class along the trenches, they're in a good position to upgrade at least one of those positions with the 18th pick.
A defensive lineman of Richardson's caliber would be difficult to pass up - particularly with Vaccaro off the board. The other option could be a guard like Jonathan Cooper or right tackle like D.J. Fluker, but Richardson grades out as the better player. He would also speed up the team's transition to Monte Kiffin's 4-3 defense.
Vaccaro would still be a fine pick if he falls to No. 18 here, and they wouldn't go wrong with either of the O-Linemen Kadar mentions. Still, Richardson is a good value here, ranking only behind Sharrif Floyd and Star Lotulelei as the best DTs in this year's class.