The Green Bay Packers have a lot of depth on the defensive line, but they’ve been watching one player for almost two years. Now that defensive tackle Joey Mbu has been signed, the question is whether the Packers have room for him. Mbu says he took a lot of notes during organized team activities and then went home to study — so he will be as prepared as possible when training camp starts July 26th. Green Bay has Pro Bowl players like Muhammad Wilkerson and Mike Daniels, plus improving Kenny Clark, standing between the new guy and playing time. That will all be hashed out at camp.