hey, sorry for replying late. For GP this stat may not be as relevant as for leagues. But still, for whole season they may be more relevant than for 1 event. You can check stats for every rider.
Nicki Pedersen won, but because of point system the real winner was Tai Woffinden. You can discuss, but most points are most points. Opponents beaten are opponents beaten.
Also this maybe somehow useful for example for 2014 season http://www.speedwayexplorer.com/speedway-grand-prix-2014-stats Because of some injuries and suspension of Darcy Ward you will see that for as far they ride final standings could look a little diffrent because of points per heat or per match:
Greg Hancock 1.99, 12.82
Darcy Ward 1.94, 11.67
Kasprzak Krzysztof, 1.86, 12.00
Woffinden Tai 1.83, 11.00
Iversen Niels K., 1.74, 9.67
Pedersen Nicki 1.70, 10.00
You may also check points per Final heat if rider made at least 2 or 3 finals, then you get:
Woffinden Tai 2,5, 4 finals
Zagar Matej, 2.00, 3 finals
Kasprzak Krzysztof, 1.63, 8 finals
Hancock Greg, 1.38, 8 finals
Hampel Jaroslaw, 1.25, 4 finals
Pedersen Nicki, 1,00, 4 finals
In american sports they love stats, speedway is very measurable sport.