Chargers acquired NT Travis Johnson from the Texans in exchange for undisclosed compensation. The Texans were fed up with Johnson's inability to practice, but they've just given up their most gifted run stopper. The compensation is likely no more than a mid- to late-round pick, making the deal a steal for San Diego. Johnson, the 16th overall pick in 2005, is only 27 and could play either end or the nose in San Diego, where depth is needed behind aging NT Jamal Williams. Houston's run defense has struggled this preseason and now looks worse.