The biggest question surrounding the defensive end position is Kyle Vanden Bosch's health. The Titans defense needs Boom King to return to 2007 form with the loss of Albert Haynesworth. I have little doubt that he will be ready to go when the season starts next season, especially seeing how he gutted it out to try and get back on the field last season.
Jevon Kearse was one of the biggest surprises in 2008. His numbers don't jump off the page at you, but he played in all 16 games and actually held his own against the run. He didn't do either of those things when he was here before. Kearse is not The Freak that we saw when he broke into the league, but he is a solid rotation guy that should have a good influence on the younger guys.
Dave Ball is another guy that Jim Washburn was able to turn into a solid contributor. Wash even said this offseason that Ball was at the top of the depth chart. Ball leads a group of solid reserves that includes Jacob Ford and William Hayes. Ford had a break out season last year with 7 sacks in limited playing time, but interestingly enough, he is currently listed behind Hayes on the depth chart.
This is a pretty solid and deep group that can be great if KVB is healthy and the Kearse/Hayes/Ford side of the line can continue to show the improvement they showed last season.