Staggering indeed. They are also deeply mysterious.
You can almost imagine a bionic superstar clone of Brady, Mahomes, and Marino producing that difference in a team's W/L record. But Alex Smith has done this without even playing well.
Is Alex so inspirational that everyone around him is suddenly much better when he's the starter? Including the defense? Does he beam waves of electrostatic despair into the brains of opposing players and coaches?
Like I said. Mysterious.