6. Marcus Mariota, QB, Oregon: Mariota’s problems are similar to McCarron’s. As good as Mariota is, the Ducks are loaded. Do-everything-back De’Anthony Thomas might be the most dynamic and dangerous player in the country. The Ducks’ propensity to pound their opponents provides plenty of fourth-quarter rest for Mariota. And anything less than a trip to the BCS title game for Mariota and the Ducks, will seem like a disappointment. Oregon will need to be just about perfect to have its first Heisman winner.