If the Carolina Panthers are going to improve on the defensive side of the ball this offseason, they’re going to need both Bobby Brown III and D.J. Wonnum to step up. Wonnum is entering his sixth season in the NFL and his second with the Panthers, but he’s also coming off a campaign in which he appeared in just eight games due to injury. Meanwhile, Brown was brought in on a three-year, $21 million deal this offseason and is expected to upgrade the interior of the Panthers’ defensive line next to Derrick Brown. Brown was placed on the non-football injury list on Tuesday.