3. San Francisco 49ers (Last week: 6)
So much for the defense taking a step back. The Niners were playing their A game on defense against Dallas, while Colin Kaepernick appears to have taken a step forward with his game.
What to know: That declining defense — well, each of its first three turnovers led to 49ers offensive touchdowns. Per Elias Sports, it was the first time in 17 years a Cowboys opponent scored 21 points or more in the first half off turnovers.
