Is the 49ers' Biggest Rival the Kansas City Chiefs?

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• Former 49ers safety calls out injury issues: 'You have to stop calling it bad luck'
  49ers Webzone
• 49ers work out three offensive linemen, reach injury settlement with D-lineman
  49ers Webzone
• 49ers training camp Day 8: Brock Purdy stays hot, rookie DT turning heads, and other quick hits
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• Recently waived 49ers WR finds new NFL home with Steelers
  Niners Wire
• 49ers updates: Nick Bosa still not practicing as another joins the injury list
  49ers Webzone
• 49ers DC may have revealed unique plan for rookie 5th-round pick
  Niners Wire