But if you want simple stats from this year:
LBJ - 36.9 mpg (reg season), 40.6 mpg (playoffs)
KD - 34.2 mpg (reg season), 37.3 mpg (playoffs)
I dont think the players complained about them being tired (mayb KD did, I didnt listen to the postgames). I think it was mostly the coaches. But some stars definitely take heavier loads in the playoffs.