That's because it's based upon self-performance with a greater...

That's because it's based upon self-performance with a greater emphasis on the previous game, and not the average. West Coast, Adelaide Crows and GWS have performed well against lower rate teams recently. Only two teams are sitting within 'Premiership' historical contention at the moment and that is Sydney who are almost identical to their 2005 premiership side except stronger in attack, and Adelaide Crows who are identical to the 2013 Hawthorn Premiership side purely because they beat their opponents well recently.