Stanford and UCLA also represent — perhaps better than anyone else — the shift in the Pac-10 from a conference that gives defense a passing thought to one that is leaning on it. Schools that have produced Elway and Aikman have asked redshirt freshmen, Andrew Luck and Kevin Prince, to not mess it up. Prince, whose jaw was broken late against Tennessee, is being replaced by senior Kevin Craft for the second consecutive game, but the message is the same.