NFL Power Rankings for Week 5: How the unlikely undefeated team is getting it done

Key Points:

• The 49ers, Chiefs, and Vikings are the only undefeated teams in the NFL after Week 5, with the Vikings notably winning two games without scoring an offensive touchdown, a feat not seen since 1923.
• The 49ers secured a 24-14 win over the Broncos with Brock Purdy throwing two touchdowns and Christian McCaffrey rushing for one, while the Chiefs edged the Raiders 30-27, highlighted by Kenneth Walker's 177 rushing yards and two touchdowns.
• The Vikings' defense has been dominant, allowing just 198 yards in their latest win, with kicker Will Reichard scoring all 15 points via field goals against the Dolphins.
• The Bills suffered their first loss of the season to the Patriots, marked by turnovers from Josh Allen and Khalil Shakir, while the Bears dominated the Jets with a strong running game and time of possession.
• Several teams remain winless, including the Jets, Chargers, Buccaneers, Titans, and Dolphins, with the Jets notably failing on all seven third-down attempts and managing only 157 yards of offense in their loss.