(Photo by Timothy T Ludwig/Getty Images) Stefon Diggs #8 of the New England Patriots celebrates after defeating the Buffalo Bills in the game at Highmark Stadium. It’s a bizarre but well-known truism in sports. A big win against a top team on one day can easily give way to a disappointing loss to a cellar-dweller the next time out. No matter how much preparation–mental or physical–goes into that next opponent, human nature just dictates that the focus level will drop, and a team that pulls an