Baseball stats tell us what has happened in the past and cannot predict the future because conditions are 100% dynamic. Stats can tell us what will happen if conditions are static. How many times have we heard about a stud player having a "bad game"? Did the stats predict when he will have a bad game? Of course not.
Stats give us a general picture of a player's current situation, but I would not rely on them too much to predict the future.
All hail The Rick