You realize that BYU is the only team not to register a sack against USF? And that includes teams like UConn and the FCS team that USF played. BYU is bottom 10 in the nation in defensive sacks, and bottom 25 in numerous other stats. This isn't a binary issue. Pointing out the defense is riddled with issues isn't denying the offense also has issues. The only difference is Tuiaki has had 4 years to install his scheme and personnel, while Grimes has only had 2.