Vaughan completed 12 of 18 passes for 106 yards .
From the naked eye , it appeared that third quarterback Dustin Vaughan and fourth quarterback Jameill Showers showed up well in the preseason opener .
quarterback completed 12 of 18 passes for 106 yards .
From the naked eye , it appeared that third quarterback Dustin Vaughan and fourth quarterback Jameill Showers showed up well in the preseason opener .