I would think it has to do with personnel. In order to play the 4-3, you need good sized horses over tackle. Next year, Cavenas will be a junior and Lynn an experienced soph. Pendergast is 6-5, 245# at last count and if Foley is being groomed for the DL, he is currently running 265#. Weir will be a 240# linebacker with speed. We may finally be getting the size of defense to make this thing work.