"That swagger is not there," said former NFL running back Gerald Riggs, who rushed for 8,188 yards in 10 seasons and now hosts a talk show on 105.1 The Zone in Chattanooga. "Chris Johnson doesn’t look confident, and he doesn’t look very happy. "He is not playing with very much passion, he is not playing with very much heart, and to me there is something internally that’s going on that’s causing that. Something’s just not right." The three-time Pro Bowler managed only four yards on 11 carries against the Patriots last Sunday in a 34-13 defeat. Dating back to the final game of the 2010 season, he’s been held to less than 40 yards rushing in eight of his last 18 games. He failed to surpass 65 yards in 14 of those games. He has only four 100-yard games in that stretch. During his 2,006-yard season in 2009, he had a dozen 100-yard games.