Keller Chryst will start as quarterback against Arizona. David Shaw announced that "we need more production in that [quarterback] position."
Just last season, the Stanford offense led by Kevin Hogan was best in the Pac-12 for points scored per game in conference, at 40.9 points/game. The offense went from first to worst once Ryan Burns took over, and is currently producing only 11.8 points/games in the first five conference games.
Although Chryst was once recruited as the top pocket passer in the country, it's not yet clear whether Chryst will represent an improvement over Burns. Chryst has played in every game this season except for USC; he's currently only 7-for-18 with an interception and a 57.