better QB then BYU they used the BYU game to practice for their QB and set up new scheme on defense from the first game they played UW in Salt Lake. So Utah was using the BYU game as a practice game for UW. As you all know Zone coverage schemes require the linebackers and defensive backs to work together to cover certain areas of the field, making it difficult for the opposing quarterback to complete passes. Zone defenses will generally require linebackers to cover the short and midrange area in the middle of the field, in front of the safeties. In the case where one or two linebackers blitz, the remaining linebacker(s) expands his zone to cover the zone responsibilities of the vacating linebacker(s). Often, blitzing will leave larger holes in the pass defense, but it is a gamble the defensive coordinator wants to make to pressure the quarterback into a poor decision and hopefully an interception or at least an incompletion.
It was not until the pick 6 and then they continuation of blitzing by Utah that they took control of the game and really flustered Wilson in to making bad passes even though many said Grimes went conservative. How can you go conservative without no RB. Utah players showed me the pass to run ratio by BYU when I was tutoring them.