I think that the stamina and the opposite D was the biggest factor for his lousy performance. I will give you 2 examples of my roster
Player A:
Jump Shot: proficient Jump Range: atrocious
Outside Def.: awful Handling: pitiful
Driving: mediocre Passing: mediocre
Inside Shot: prominent Inside Def.: strong
Rebounding: proficient Shot Blocking: mediocre
Stamina: average Free Throw: average ↑
He shoots 0.494 on his way to his 19.6 points
Player B
Jump Shot: respectable Jump Range: inept
Outside Def.: atrocious Handling: inept
Driving: awful Passing: mediocre
Inside Shot: proficient Inside Def.: prominent
Rebounding: prominent Shot Blocking: inept
Stamina: mediocre Free Throw: inept
0.575 on his way to his 13.1 points
My other C with awful JS, but prominent IS shots 0.56, so i dont see how the JS was such a big factor. Note that i am playing most of the time look inside