Garrett Nussmeier and the (good, but not great) LSU group of pass catchers have had to carry the LSU offense by themselves. With no semblance of a run game, defenses have been able to be exotic and aggressive on every down instead of just third and long. If you have to bring a Safety down in the box, you can only play Cover-1 or Cover-3, if you can keep them both deep (even if they do have a run D responsibility), you can play Cover-2, Quarters (Cover-4), Cover-6, Cover-8, Cover-1, Cover-3...every coverage ever invented and every variation therein with more specialized rules and adjustments than you can access with a loaded box, while it all looks similar pre-snap.