“During spring ball, we practiced a 4-3 the entire time. It was a true 4-3 rather than some of the other 4-3s we have ran in the past,” senior defensive tackle Bracken El-Bakri said last week. “We are going to carry all three of the fronts we have shown in the past for different games and different situations, but for the most part we are playing a four-down front.”

Does he mean that they'll use goal line personnel for short yardage and nickle personnel for passing downs? Otherwise, it's base 4-3?

What "three fronts" is he talking about?