What explains the random ortment of mascots in the Nissan Heisman commercial?

The commercial has mascots of teams with legitimate Heisman candidates such as a gigantic Buckeye (Ohio St.) and a Mountaineer (West Virginia), but I've also seen a Cyclone (Iowa St.), a Sun Devil (Arizona St.), a swarm of Yellow Jackets (Georgia Tech), a Trojan (USC), an Elephant (presumably Alabama), and a Tiger (LSU? Auburn? Clemson?), teams which certainly don't feature a Heisman candidate. My question is, why were these random mascots included, and why was the mascot of preseason Heisman favorite, Brady Quinn, not included?