The Broncos’ home opener became an episode of “Are You Smarter than a 5th Grader?” Coach Sean Payton staring down at his Waffle House menu-sized playsheet in disappointment remains the lasting image of a forgettable Sunday afternoon. Payton crunched the numbers, relied on his instincts, and made a series of baffling if not indefensible decisions. He is a potential Hall of Fame coach, and it was hard to leave the stadium not believing this rebuild is bringing out his worst. Let’s start at the end.