I use to be in a sim league very similar to this, all the player stats were individualized no matter if it was Tom Brady or Joe Blow off the street. The sim went off of the pervious years real NFL stats. The stats for a sim year would not be exact as the real NFL year but it would be fairly close. For example if you have Tom Brady at QB in real life he throws for 5,000 yards, in the sim the following year it would be close to that, but if you have nothing but lower level WR'S on your sim team he would not get close to that.