My point is the margins for error are slim in the NFL. It's the ultimate team sport, mentality as a unit is imperative. When doubt seeps in, you are not playing your best. When teams rest starters, more times than not they seem out of rhythm, unless you are the Robot, aka Manning and players of that caliber. Why not stay fine tuned and ride the wave? Interrupting that flow is messing with chemistry that I believe has bitten way to many teams in the ass.
My prediction for Super Bowl victor is Chargers beating Vikings 27-17