^it's true (&obvious) that Luka played much better than "-12", and I do like that advanced box score feature. At the same time, Luka does tend to make some critical defensive mistakes, which could also partly be from tiredness.
https://streamable.com/w66hos
But take the dagger 3 play as an example - and it illustrates why a team like GS is so dangerous due to their multiple weapons.
Look at the great defense Brunson plays on Poole, forces him to give it up, then Bullock takes on Klay and while Klay did get a little bit of a step on him on the drive, Kleber is in the right spot to help so Klay dishes it out once he sees that, and for some reason Luka is giving Stephen Curry, the best shooter of all-time, all the room in the world.
Lazy/tired closeout which Steph easily sidesteps to sink the dagger. ballgame.
Having multiple elite options who can drive/dribble/kick/shoot means GS can afford to test the defense and wear down the shot clock while still ending up with a great look/shot, after finding the hole or weak link.