Where do you guys get this stuff from? Watch some more ESPN highlights and keep pretending like you know basketball. Perk was a good man defender in the low post, but overall as a defender he was just average. The reason the Celtics have an elite defense is because of KG. You can see it in the numbers. When Perkins missed time, the numbers barely changed. Without KG, there is a significant increase in points allowed and opponents FG%. And the reason he factored into game 7 of the Finals is because of the Celtics lack of depth at center. They had him and an out of shape Rasheed Wallace, that's it. Assuming they are healthy this year, they now have 4 centers.