Today, Mack Brown explained in-depth his decision to dismiss defensive coordinator Manny Diaz. New defensive coordinator Greg Robinson will earn $250,000 on a one-year contract. Brown said during his weekly Monday press conference, “The decision to change defensive coordinators was based on our lack of ability to stop the run, period. We had that problem at times last year. I thought we had straightened that out at the end of last season, especially in the Oregon State game, our guys did a great job, but Saturday night was unacceptable.