49ers mailbag: What problems does Green Bay pose? Biggest threat to an upset? How will SF replace Adam Peters?

My biggest concern will still be trying to slow down the Green Bay offense. The 49ers' defense has been up and down in 2023. They are finally healthy and rested, so I'd expect them to come out with their hair on fire, but anything can happen in this league. And the 49ers need to guard against any kind of letdown that could lead to an upset.

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