There's an old saying, "The guys who talk it the most, do it the least." I also remember one of my first coaches telling me, "The dog you have to worry about isn't the one that's barking - it's the one that just comes up and takes a piece out of your ass."
All the guys that talk smack do it for a reason - they want people to be afraid of that image. Duncan is the definition of a badass. He doesn't talk because he doesn't need to. Good article, but it sadly only plays to a small audience. Too many people want to believe that chest-thumping actually means something, because that gives them hope. Maybe if they beat their own chests enough, somebody will pay attention to them someday.
After 12 seasons in the league (plus 2 1/2 seasons of playoff games), playing with bad knees, and with no help from anyone but Tony Parker, he still managed to put up 30 in that last game against Dallas. Everyone in the arena knew where the ball was going. And it's not like the Mavs didn't want to stop him - they couldn't. That's badass.