If you had to pick one X-Factor on the team that may mean the difference between bowling and staying in Ames in December, what would it be? In my mind, ISU has some strength at RB, WR, and CB, with signs of optimism on the OL and DB. The team has some other obvious holes that have been discussed here throughout the summer, but as we reach the beginning of the season, which of these holes must be filled to give us a warm destination in late December?