Super Bowl champion Seahawks defense vs. Brock Purdy’s 49ers will be one of Week 5’s top battles. Here’s why

Sean M. Haffey / Getty Images How well is San Francisco 49ers quarterback Brock Purdy playing right now in his team’s 4-0 start to the 2026 season? He’s on such a tear that he created his own statistical club. Purdy is the only quarterback in NFL history to start 4-0 with one or fewer sacks, fumbles or interceptions combined, according to CBS Sports Research. Purdy leads the NFL in passer rating (126.2), passing success rate (61.9%) and expected points added (EPA) per dropback (0.53) while co-leading the league in passing touchdowns (11). Purdy’s EPA per dropback of 0.53 is the…