Sean Hewitt wrote:becasue I don't understand your conclusion.
What has happened subsequently isn't relevant. If you look at the grades for January 2013 and July 2012, you see a long list of Stockport League games, nearly all of which were wins. A number of these were against players graded 40 points below 177 (or even 40 points below 167) so a number of the wins were boosted by the 40 point rule.
In the Stockport league, the 13 games played as part of the July 2012 grade had an impressive won 11 drawn 1 lost 1 tally.
Without the effect of a 40 point rule
138 143 169 139 143 100 146 114 106 137 127 144 165
giving a 175 performance for that league
With the 40 point rule assuming 137 as the cut off
138 143 169 139 143 137 146 137 137 137 137 144 165 giving a 182 performance.
If 127 is the cut then
138 143 169 139 143 127 146 127 127 137 127 144 165 giving 179.
It's well known that the 40 point rule protects the grades of players much higher graded than their opponents and that is its purpose. Treating Juniors as new players now enables them to benefit as well if they can run up a high score so as to trigger a high relative grade in the estimation process. Improving adults, by contrast, can be held back as they always have been.