Cousins is finishing his 5th year, Tom Brady was an above average game manager around that point in his career, he wasn't spectacular in his first superbowls..made the plays he needed and took care of the ball, Aaron Rodgers was just coming off the bench to replace Favre. The greatest in the game just started rolling about year 5...i don't think cousins has hit the ceiling especially if he has more talent around him...if be very pleased to go into 2018 with Cousins and shady in the backfield