Yes, we play a 3-man front, but we did rush 4 several times--more in the USC game than in other games to my memory. One of the benefits of the 3-4 versus the 4-3 is that you can bring in an extra rusher from anywhere without compromising your backfield coverage or telegraphing pre-snap where the blitz is coming from or if it's coming at all. And BYU tends to do better at recruiting linebackers than D-Linemen. So I like it so long as we have the horses to get pressure on the QB and not give him all day.
And while Khyris is absolutely blowing up the middle, Devin Kaufusi has done a respectable job on the end--he just wasn't available the last half of the Tennessee game or the first half of the USC game because of the targeting penalty at TN.
Several of the pressures and sacks against USC were generated by the good coverage by the backfield and the fact that the offenses in our first three games see much more man defense than zone, which may have caused some confusion and hesitation by the quarterbacks--especially when they started throwing passes that were broken up or picked. So yeah, Tuiaki's base defense worked well against TN and USC, and really against Utah, too. Doesn't mean the embodied embarrassments at Sports Nation know what they're talking about, though.