49ers pregame: Brock Purdy returns, Josh Dobbs will back up rather than Brandon Allen
Briefly

"Brandon Allen has been demoted to the No. 3, emergency role for tonight's game against the Buffalo Bills, with Brock Purdy expected to start after a shoulder issue."
"The weather conditions provided the biggest mystery ahead of the 8:20 p.m. ET kickoff, after over two feet of lake-effect snow fell on this suburb since Saturday."
"The 49ers announced several key players ruled out, including Nick Bosa and Trent Williams, highlighting their struggle with injuries as they face the Bills."
"The Seattle Seahawks emerged alone in first place after their win over the Jets, affecting the NFC West standings as the 49ers look to improve their record."
Read at www.mercurynews.com
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