The 32 things we learned from Week 4 of the 2021 NFL season:
1. Who's No. 1? After trouncing their division rival (and previously undefeated) Los Angeles Rams, the Arizona Cardinals have emerged as the league's only 4-0 team – on a day when the Carolina Panthers and Denver Broncos were exposed as products of their early easy schedules – though the Cards could be joined by the Las Vegas Raiders by the end of Monday night. Still, who had Cards-Raiders as their Super Bowl 56 picks? (And does anyone want that now?