The numbers might suggest otherwise, but the Lions are making strides defensively, and much of it has to do with much-improved play in the trenches. And for all that DE Kyle Vanden Bosch has added in the areas of effort, leadership and production, it would be remiss to overlook the play of the defensive tackles. No question, rookie Ndamukong Suh has been a revelation, both stopping the run and rushing the passer. If there's one element of his game that needs improvement, it's his level of maturity. His lack of discipline has reared its head in the form of penalties and getting out of gaps at times, but a team source says the Lions in no way want to temper his enthusiasm. But equally as impressive has been Corey Williams, who is back at home in a 4-3 scheme that plays to his strengths far better than the Browns' 3-4 defense did. He's playing upfield with his quickness and slanting into gaps to make plays. Third DT Sammie Hill also should not go overlooked, as his work — especially in short-yardage and goal-line packages — has been strong.