By Matt Audilet The Dallas Cowboys will have a special guest picker for tomorrow night’s third-round pick. Franchise legend Emmitt Smith will take the stage in Las Vegas to announce the Cowboys’ No. 88 overall pick on Friday evening, per Dallas insider Jon Machota. The NFL world took to Twitter to react to this news. “Can he just become our GM?” one Cowboys fan asked. “Let’s go!!” another said. The NFL released a full list of former and active players announcing draft picks in the second and third rounds on Friday night. In addition to Smith, Barry Sanders, Tony Gonzalez, Austin Ekeler, Aaron …