SANTA CLARA — Jimmy Garoppolo isn’t the only reason the 49ers are beginning to win.
For the past four games, the 49ers defense has been one of the best in the NFL. It ranks fourth in yards allowed per game, fourth in rushing yards allowed per game, tied for sixth in points allowed per game and seventh in passing yards allowed per game since Week 10.
In related news, rookie linebacker Reuben Foster has been healthy the past four games. He missed six of the first eight games this season with ankle and rib injuries.
Is Foster the main reason the 49ers defense has improved, or are other factors involved?
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