re: LSU Ranked #15 in both polls

There are many rules with the BCS, the most important being that any one conference can send a maximum of 2 teams to BCS Bowls. So the SEC will likely send Bama and Auburn, LSU is too far down the list this year.

The rule you are referring to I believe applies to undefeated teams from non qualifying conferences (no BCS tie in). So it wouldn't apply to the SEC, Big 10, PAC 12, Big 12, Big East, and ACC.