Chris Johnson has 495 yards and six touchdowns in the three games Vince Young has started, an average of 165 yards per game. In the first six games, when Kerry Collins was the starter, Johnson averaged 99.3 yards while totaling 596. Johnson has averaged 25 the past three games compared to 16 in the first six. "It's one thing to stop Chris Johnson, but with Vince Young now in there the speed of that backfield and what they can do is a lot different,'' said ESPN's Marcellus Wiley, a former NFL defensive lineman. "With Young behind center, you know that the threat of him running is there. That preoccupies defenders, and they have to start thinking about one more dimension coming out of that backfield."