They lost their star running back last week. Also, they really like the quick strike passing game. They do a lot of short yardage pass plays. You can attack passing lanes, disrupt receivers at the line, collapse the pocket. This is going to be a tough test for the D.
You are still right though. This defense is very capable of stopping the run and the pass when they know whats coming. They do have a tendency to get fooled for big yardage gains when caught off guard. What would be nice, is take away the Chargers passing game and force them to run.