It's Stanford's Andrew Luck.
Here's what Kiper has to say about Locker's terrible game vs. Nebraska:
Still, it's hard to ignore the dreadful showing Jake Locker had against Nebraska. While I noted in Stock Watch that the totals were worse than the tape -- Locker was facing a loaded secondary, and was constantly harassed and forced to simply dump the ball -- he's still due for a fall. It's a developmental issue. NFL evaluators still see significant talent, but they are hesitant to take a QB as high as No. 1 overall if they think he needs significant tutoring at the NFL level. They simply can't have the patience because of the tenuous nature of their own jobs. So Locker takes a hit this week.
Kiper therefore drops Locker to No. 4, though he still lists Locker as the No. 1 senior QB.
Also on the Big Board: The UCLA duo of LB Akeem Ayers and S Rahim Moore are rated 18th and 24th, respectively.
Other top Pac-10 seniors:
USC's Ronald Johnson is the No. 2 receiver.
USC's Kristofer O'Dowd is the No. 3 center.
Oregon State's Stephen Paea is the No. 2 DT.
UCLA's Kia Forbath is the No. 1 kicker. Arizona State's Thomas Weber is No. 3.
Arizona State's Trevor Hankins is the No. 2 punter, while Washington State's Reid Forest is No. 5.
As for Pac-10 non-seniors:
Luck is the No. 1 QB. Arizona's Nick Foles is No. 4.
USC's Jurrell Casey is the No. 3 DT. Arizona State's Lawrence Guy is No. 5.
USC's Chris Galippo, who doesn't start, rates as the No. 5 inside linebacker.
Ayers is the No. 1 OLB. Moore is the No. 1 safety.
Washington's Erik Folk is the No. 2 kicker.
Cal's Bryan Anger is the No. 1 punter