Brown held the top start at the start of the season as the coach of the reigning national champions. Brown's Longhorns edged Carroll's Southern California team 34-31 in the Rose Bowl to capture the 2005 national title.
Brown wasn't the only Texas coach to fall from the No. 1 spot in the Rivals.com power ratings, which measure the nation's top players and coaches at each position. Virginia Tech's Bud Foster replaced Texas' Gene Chizik as our top defensive coordinator.
The loss to Ohio State ended a personal 29-game winning streak for Chizik, the defensive coordinator of the undefeated 2004 Auburn team.
Those represented the only changes at the top in the rankings this week.
The ranking of a player and coach can fluctuate each week depending on how they fared the previous Saturday, but the power ratings measure their overall careers as well as their most recent performances.
For example, we believe Florida State linebacker Buster Davis ? one of the fastest-rising players in our ratings system ? has outplayed Penn State's Paul Posluszny so far this season. But is Davis a better player than the reigning Bednarik Award winner? We don't think so, which explains why Posluszny continues to be rated higher.
By the end of the season, our power ratings should provide an accurate indicator of which players and coaches were the best at their respective positions.