Why do people think that things will change with Lance Anderson? Maybe they will because of a new scheme. Maybe they won't.... based on how well Stanford's defense has performed.
My two cents: BYU needs to 1) Modify the scheme or pick a new one (pressure QB, get off the field... while still limiting big players), 2) hire a DC that isn't as laid back as Kalani, Arod or Tuiaki. Grimes was a good pick up because he was respected by the team and instilled a sense of discipline/accountability (from my limited understanding) and he was good with the Oline.