Aug. 29—STILLWATER — A season ago, Oklahoma State had a stout defense, but the offense was stumbling behind a makeshift line. Kasey Dunn, as a first-year offensive coordinator last year, realized it was his best option to simply not screw things up for that talented Cowboy defense. “What we did offensively wasn’t necessarily what we wanted to do,” Dunn said. “Our defense played really well and…