To say that the San Francisco 49ers' first full week of training camp was flush with storylines would be an understatement. Injuries, free-agent signings, and fights dominated the front pages in what was a chaotic start to the team's 2026 campaign. 49ers know who their X-factor isIn saying this, Greenlaw is saying the quiet part out loud. Christian McCaffrey is the clear engine in their offense. 49ers already looking to McCaffrey to do what no one else canThe Stanford alumnus has established himself as the team's clear X-factor despite sharing the field with players like Brock Purdy, Mike Evans, and George Kittle.