Brock Purdy isn't necessarily a product of Christian McCaffrey, but he's so much better when McCaffrey is on the field. When McCaffrey plays, Purdy's passer rating is 111.9 and his win-loss record is 18-4.

Don't expect the San Francisco 49ers to take their foot off the gas in their usage of running back Christian McCaffrey. McCaffrey returned in Week 10 after missing the first nine weeks to work through Achilles tendinitis.

The San Francisco 49ers have a new weekly problem to solve now that running back Christian McCaffrey has returned from Achilles tendinitis. While it's certainly a positive that the reigning Offensive Player of the Year is back in their lineup,