Usually people get on the cover of Madden after a break out year. So really what we should be looking at is stats of players before and after their career years. Normally they go downhill. Just look at CJ2K, it didn't take the Madden curse for him to become a mess on the field.
Edit: I was also thinking when the season gets closer, we should set up a GB Fantasy league!
Did any of you guys see how if you keep hitting random select during "play now", the Madden Developer team comes up? They are all 99's and are great for getting achievements. The QB rushing achievements got a lot easier for me. haha