Oakland Raiders camp battles: Defensive tackle-Tommy Kelly, Terdell Sands, Gerard Warren and more compete to be the muddle in the middle

As the Oakland Raiders "Camp Battles" series moves from the side of the ball that scores points to the side of the ball that stops other teams, its time to look at the position that was by far the biggest question mark coming into the offseason, the defensive tackles. Last year's crew was woeful at stopping the run. Warren Sapp has retired, Tommy Kelly has moved from end to tackle, William Joseph has been signed, and both Terdell Sands and Gerrard Warren return. Josh Shaw is hanging around despite being inactive for most of 2007.