both offensive and defensive. Defensive rush is critical and the key to trigger a LB happy squad. One thing I would like to see Bronco do is mix up his defense with 3-4.4-4-3 and 3-5-3. What would be more confusing to any offense is to go to pre snap and boom, defense has switched.
Not sure if talent can comprehend all that information (I believe the players can) but we haven't seen such a thing at BYU. Defenses should be confusing, but the basic foundational things will never change (pass rush, proper tackling, reading the offense).