After BYU’s defense gave up seven touchdowns and 644 yards in a 52-35 loss to Arkansas a couple weeks ago, head coach Kalani Sitake made some significant changes to the way the Cougars’ defense is coached.. Defensive coordinator Ilaisa Tuiaki was moved to full-time defensive line coach and began coaching from the sidelines instead of the press box. . Defensive ends coach Preston Hadley …