The Carolina Panthers hope to have upgraded the left tackle position over last year's starter Byron Bell. Bell struggled greatly against faster defensive ends who could quickly divert around him.  Bell's replacement, Michael Oher, appears to be having the same issue early in training camp.  Oher had a tough time today containing Mario Addison and Frank Alexander in the first practice where the players were in full pads. On more than one occasion, Cam Newton would have been sacked if not for the