Los Angeles signed Mekhi Becton to a two-year, $20 million contract as a free agent in March, putting a 2024 Super Bowl winner into the Chargers’ lineup at right guard. But when Los Angeles became the first NFL team to have a full-squad training-camp practice for the 2025 season on Thursday, the Chargers still had a decision to make at the other two offensive-line positions, even though they return a starter at each spot.