Purdy generated a career-low starting 36.7 passer rating in Week 7. His three interceptions were the second-most in a game in his career (four against Baltimore in Week 16, 2023). The Niners are 0-5 when Purdy has two-plus INTs.

Purdy was particularly poor on third downs, going 1-of-6 for 41 yards and two INTs (16.0 passer rating) versus Kansas City.

Missing so many weapons left the Niners ridiculously depleted. Beyond George Kittle, the Niners’ passing offense is a shell of itself. Fourth-round rookie Jacob Cowing led all wide receivers on Sunday with two catches for 50 yards. With Aiyuk’s prognosis not looking great, the Niners need Purdy to raise his game.

Purdy is 14-2 when Samuel, Christian McCaffrey and Trent Williams all play in his career. He is now 6-6 when one or more of them miss the game in his career.

“We didn’t do anything really good on offense,” Shanahan said. “I know he’d love to have all three of those picks back. Brock’s been playing unbelievable this year, done some good things on offense this year, but today wasn’t that day.”

Steve Spagnuolo’s defense has a way of discombobulating even the best QBs. A shorthanded one allowed the Chiefs to feast.