Technically you're approaching this with a flawed "hindsight" view.
Through this same point in time as Blake Griffin has been injured along with the players taken after him, here are Durant's numbers:
Durant: 20.3 pts, 4.4 reb, 2.4 asst, 1.0 stl, PER of 15.8
At this same point in their NBA careers, here are two players taken over Blake Griffin.
Tyreke Evans: 20.1 pts, 5.3 reb, 5.5 asst, 1.5 stl, PER of 18.2
Steph Curry: 17.5 pts, 4.5 reb, 5.9 asst, 1.9 stl, PER of 16.3
Steph is actually pretty close in skillsets to Durant as well. So could end up in the same realm there.