I've only looked at last years Defenders for this analysis. I used the top 10 Defenders from each of the three different catagories: Average, Aggregate and PIT65. For those new here, PIT65 is the total/average you get when you replace a Defenders score for missing a game with a Rookie, who we will assume scored 65. The percentage section of the table shows how their average score varied from their overall average score. It is broken up into wins and losses, and then by margins in wins and losses.
Individually there is quite some variance, but when we look at the bottom line, there is no great surprise. I was a little out with my 5-7% guess, as the variance is 4.5% (I will give myself a B, or 7/10 for my guess). We can see a predictable trend when those wins and losses are broken up into smaller and larger margins, too.