I believe it is some combination of:Totally agree on improvement from last year. You credit PK. I believe its more Gary Patterson. I dont really care who improved it but last year was far below whats acceptable for Texas.
1) players maturing in the defensive scheme, leading to
2) better and more consistent execution
3) coaching, with credit to both PK and GP, plus every defensive position coach
4) same defensive scheme for the 2nd year, making it easier to teach and retain concepts, and to execute assignments without thinking about them, which leads back to point #1