One of the primary storylines throughout Week 5 was a curiosity over how many undefeated teams would make it through the weekend maintaining that moniker. College football's oft-unbalanced schedules create circumstances in which teams can get through the first month of the season with a zero in the loss column even if that's not indicative of their true standing within the sport. It's right about now -- one-third of the way through the season -- when conference play begins and that number declines rapidly.Week 5 was a "prove it" period for many teams in the eyes of the AP Top 25 poll voters.