look at how little push the o line has gotten on any of the first four opponents. That line has not blown anybody off the ball. They just aren't big enough or strong enough to get any kind of push. It is why the rushing attack has gone basically done nothing.
Take the Utah game. The rushing attack was non existent, and Tanner was rushed many times. One of his interceptions was because one of the ends got to Tanner quickly, and hit his arm as he was trying to throw a deep pass.