Ted Miller On Tuesday, we looked at the five worst defenses in the Pac-12 in 2012: UCLA, California, Washington State, Arizona and Colorado. The issue was not pointing out past badness but considered the potential for 2013 improvement. That included returning starters, defensive line starters back, star power and the biggest personnel loss. Here's our chart: We've already offered our take: While all five teams have the potential to improve, perhaps significantly, the most likely to make a big jump is Arizona, due to 11 returning starters. Originally posted by ESPN.com - Pac-12 Blog Click here to view the article.