What happened: The Kansas City Chiefs are beginning training camp with their championship window tied to the recovery of Patrick Mahomes. The quarterback has been fully cleared for participation just seven months after suffering a torn ACL.

Why it matters: His mobility and improvisational skills are the foundation of Kansas City's offensive system. The rapid recovery timeline introduces uncertainty about his early-season effectiveness as the franchise attempts to maintain its standing atop the league.

What to watch: Coaches will evaluate his movement in live drills to determine his workload for the remainder of the preseason.