I can see a Yannick Ngakue type of rookie season from Kemoko Turay if he can stay healthy. But if I had to bet I would choose the easy answer - Darius Leonard. I loved him in the draft and I think he can be a great 3 downs LB in the league. I think he's pretty much the only defensive player we drafted this year who is likely to be a 3 downs player in year 1 and I think he has the talent to stay on the field on all 3 downs and thus most probably have the biggest impact.