Safety Jalen Mills has been preparing for the 2020 season all summer long, a big year for the fifth-year player as he tries to take on a bigger leadership role in the secondary. It’s unclear if the NFL will hold a full training camp, play any preseason games in August, or begin the regular season on time. Things are largely up in the air for guys like Mills, who are expected to be ready when play starts. It’s a tall task.