Purdue seemed to play down to their competition at times, but I think that's a natural thing with minimum talented teams who tend to play above their perceived ability against ranked teams.
A good coaching staff can get lesser talent to compete and win with a great game plan, great confidence and the will to risk it all. Against weaker teams, there's a natural letdown but the team isn't talented enough to still win convincingly.
Brohm hasn't shown he can be successful as the hunted instead of the hunter, but he now has much more overall talent to work with.