I think it's all about natural instincts and vision with CJ...The great backs with his-type of ability (like McCoy and Charles) seems to glide through the little creases while CJ always seems to find the closest tackler...They say in the NFL the RB has to beat at least one guy to get a decent gain, and with all his natural ability CJ rarely does that...I just think he struggles when the blocking is not phenomenal...And great backs, heck even good backs like Freddie who have a better feel for it, make that 1st guy miss a lot...IMHO If CJ had McCoy's, or Jamal Charles' feel for the game and natural instincts he would have 2000 yards every season...But he's just not in their league...