Durant's 3pt% isn't that great, 37%. It's certainly worse than Klay's. Klay is shooting 51% from the floor, and 48% from 3. Curry is shooting almost 7 percentage points lower at 41%. That's a much larger difference than the 37% vs 31% between RW and KD especially if you consider the point difference between shooing 48% and shooting 37%.
Kobe's FG% last season was 46%, his 3pt shooting percentage was low however that effects his FGA since a 3 is still a FGA. Right now Curry is at 43% from the field, 41% from 3.
Granted, last season Curry had a higher FG% and Klay a lower one, but chuckers don't know how to adjust, they just chuck. That's evident by how Curry still takes the most FGA even though the efficiency is elsewhere.