Being ranked in September is great, but many teams have yet to truly be tested in the 2013 college football season and will eventually be bounced from the polls as they carry on through the year.
Florida entered the season with BCS aspirations, despite an extremely difficult SEC schedule. Now the Gators will have to move on without one of their leaders on each side of the ball, making a slide out of the rankings a definite possibility.
Meanwhile, one of the best teams in the nation from last season may prove to have a tougher rebuilding task than originally thought.
In the Big Ten, a number of teams are near the tail end of the current rankings, leaving at least one faced with an inevitable drop from the polls.
Finally, in the wide open Big 12, one team could be headed for a late-season skid that will see it out of the final rankings.
Note: All rankings based on the Week 5 AP Top 25.