Clary is a solid right tackle, but he lacks the foot-speed to keep up with speedy pass-rushers. That was most evident during last year's postseason run, when Clary allowed two sacks to Robert Mathis in the Wildcard Round and two more to LaMarr Woodley in the Divisional Round. Clary is still only 25 years old and has plenty of room for improvement, but too often he moves his feet like he's playing in cement.
WR Buster Davis: Persistent Pains
Coach Norv Turner alluded to Davis' cyclical problem earlier this offseason: Davis keeps enduring nagging injuries because he's not in football shape, but he can't get in football shape until he avoids nagging injuries. Davis put some of those worries to rest with a strong offseason, but even still he was plagued by nagging pains in his quadriceps and groin. He must prove he can stay on the field -- and for more than a handful of snaps at a time -- if he hopes to carve out a spot in the rotation.
LB Shaun Phillips
Phillips loves to anticipate the snap count, which leads to an exorbitant number of offsides penalties. And while the payoff is sometimes worth the penalty -- he has averaged more than nine sacks per season over the last three years -- the Chargers do not have the kind of defense that can afford to give away yardage. Also, more penalties result in fewer passing situations, which prevents Phillips from doing what he does best.
CB Quentin Jammer: Stone Hands
Jammer has quietly emerged as San Diego's best defensive player. Ironically, his improvement only highlights his greatest flaw; the more time Jammer spends around the ball, the clearer it becomes he has virtually no ability to catch it. After seven years in the NFL and countless programs aimed at improving hand-eye coordination, it is clear Jammer will never become a ballhawk. But because he is so good at everything else, this is a flaw the Chargers can live with.
SS Clinton Hart: Airborne Antics
Hart is a solid run defender when healthy, as evidenced by his 85 tackles in 2007. However, he has developed a bad habit of leaving his feet to make tackles, especially when chasing down runners on the edges. And while this leads to the occasional pad-podding collision, it also creates huge running lanes when Hart fails to bring down the ball carrier. He'll have to tighten up his technique in 2009 if he hopes to hold off Kevin Ellison and Steve Gregory for the starting position.
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Michael Lombardo is a member of the Pro Football Writers of America and a long-time contributor to the Scout.com network. His analysis has been published by the NFL Network, Fox Sports and MySpace Sports. He has followed the Chargers for more than 15 years and covered the team since 2003. You can see more of his updates by following him on twitter.