Excellent points Kidd K, I forgot about Durant.
If you look at OWS and ORtg comparisons between Kobe and Durant, it's not even a comparison.
Durant, after only his 6th season, has already had a season of 13.6 OWS and another of 11.1. This year, he is so far leading the league in OWS, with an extremely high 11.3 after only 60 games. The reason he didn't have more double digit OWS seasons is because of the lockout season.
In terms of ORtg, he had seasons of 123, 122 and 118, all higher than Kobe's career high.