For a little more perspective on the odds for AJ and DD:
There are 4 WR slots and 3 RB slots.
Last year AJ was the 6th most productive WR in the AFC--200 more yards would have put him into 4th (that really does look achievable), 300 more into 3rd and 400 more into 1st. The pro-bowl WR's appear to have been selected purely on yardage.
DD was the 11th most productive RB in the AFC--to break into the top 3 DD would have needed another 561 yards. The RB's selected were the 1st, 3rd and 5th on yardage. Holmes at 5 did set a new record for TD's. Taylor at 4th on yardage had two less TD's than DD. Still don't understand how Portis had less rushing yardage, less than half the receiving yards, only one more TD and still beat Tomlinson other than play-off team vs. horrible team. Anyway, even 2000 combined yards won't guarantee DD a pro-bowl berth.
The Art of War