What does it have to do with him? Bad players are bad players regardless. When has Duncan taken a bad player and raised him to respectability?
Off the top of my head, I can think of two common teammates of KG and Duncan. Terry Porter (who was the starting pg when KG came into the league) and Rasho Nesterovic. Take a look at the numbers and tell me what city they played better in.
Then take a look at how many different starting centers and point guards have come through Minnesota and compare that to the consistency Duncan has played next to.
Duncan has all the advantages in terms of teammates, front office, coaching, consistency in the franchise, the luck of being drafted to a team that wasn't really even that bad. He has all the advantages except for one, that being his ability as a basketball player.
As far as the late-game play goes, neither is too hot, but name a big man who is. Clutch play is all about the guards and we all know who's played with the better guards. With that in mind, take a look at
Duncan's clutch play #s from 82games.com and compare it with
Garnett's clutch play stats.