It shows up in the rebounds and defense. Hardly effects shooting % but when guys are tired they drop more balls out of bounds and become terrible defenders. They wont come out the game unless their sub is "better" at whatever the coach has decided is important. Your starters should have Average or better Stamina and a back up with about 60-80% of their salary. Bench players don't need the stamina because they only play 2-3 minutes a quarter. My top 7 guys are 7+ in Stamina.