Regardless of a team's perimeter defense, all is lost if the paint is left vulnerable.
Weak perimeter defense allows dribble penetration, and weak interior defense allows these players to finish at the rim. Even strong perimeter defense can be countered by throwing the ball into the post, where strong interior defense is needed to force a miss or come up with a block.
1. Andrew Bogut (3 points)
Bogut is one of the best interior defenders in the NBA. Again, he has not been at 100 percent all season, but he still makes all the difference inside for Golden State.
Bogut is a natural shot blocker, using great lateral quickness to rotate when the lane is penetrated, great anticipation and timing to avoid fouling and excellent leaping ability in order to meet would-be scorers near the rim.
Bogut leads all Warriors rotation players with a defensive rating of 100.
2. Festus Ezeli (2 points)
If Bogut is so important inside, why were the Warriors so successful with him absent for the majority of the season? Because Festus Ezeli has defensive ability beyond his years.
The Warriors' rookie center has above-average ability to block and alter shots, but he also brings a lot of strength and the ability to commit hard fouls when necessary. He can't guard skilled opposing bigs like Bogut can, but can deter slashers from attempting to finish at the rim.
3. Andris Biedrins (1 point)
Biedrins plays far less than Bogut or Ezeli and lacks the strength that they possess. However, he has, by some measures, been the most effective of the three defensively. Biedrins leads the Warriors with a defensive rating of 98 and with 3.1 blocks per 36 minutes.
Of course, Biedrins also commits 7.1 fouls per 36 minutes, so considering him the team's best shot-blocker would be absurd. His lack of strength also limits him.
Still, having a third-string center as defensively skilled as Biedrins is a luxury for Golden State, so long as he remains the third-string center.