If KG isn't or has never been an elite shot blocker, than Perk clearly was not even a very good shot blocker ever.
/end sarcasm
. . . KG is the best defender and shot blocker the C's have ever had since McHale.
Defender, yes. Shot blocker, no.
Blocks per game:
2008: Perk: 1.5, KG: 1.3
2009: Perk: 2.0 (6th in NBA), KG: 1.2
2010: Perk: 1.7 (10th in NBA), KG: 0.8
Block percentage:
2008: Perk: 4.9% (10th in NBA), KG: 3.1
2009: Perk: 5.3% (5th in NBA), KG: 3.1
2010: Perk: 4.8% (8th in NBA), KG: 2.2
Perk is a significantly better shot blocker than KG has been with the Celts. He's consistently been in the top-10 in both blocks per game and block percentage, while KG hasn't been. KG is the better overall defender, but Perk trumps him in terms of rejections.