Most of the favored teams won on Sunday, but there was still a little drama, including a mistake-filled performance by the leading candidate for the Most Valuable Player Award, an unbelievably bad day for a veteran kicker and an upset led by a rookie quarterback making his first start. And the Pittsburgh Steelers, who started the season 11-0, have lost two games in a row.
Here’s what we learned:
The Chiefs are not fair. Coming into the day, Patrick Mahomes appeared locked in for the second M.V.P. Award of his career and had been intercepted just twice in 463 passing attempts.