AMES, Iowa (AP) — Iowa State knows it can lean heavily on Jake Knott and A.J. Klein, among the best pair of linebackers in the country. It’s the other nine guys on defense who will determine just how far the Cyclones can go in 2012. Iowa State has plenty of depth on a defense that got better as last season wore on. But where all those pieces fit within the big picture still needs to be sorted out as the Cyclones prepare to open the season on Saturday afternoon against Tulsa. Coach Paul Rhoads says the defense has improved since last season, when it allowed nearly 30 points a game. But Iowa State won’t know how much better it is until they face someone else.