Just like Brent Barry said, "plug anyone in, and the system never changes". We are going to run our sets and we are going to help each other on defense.... That's what the Spurs always do. Plus I think Jefferson gets some of TD's 4 down pla differentys. Also when Duncan needs rest or is out and teams like OKC pack the paint and close out on our the point shooters, what do we do? We're going to need a Duncan like post threat to collapse and double team down low to free up our shooters for easier shots. Sorry Tiago doesn't give us that. He gives us a good dimension for bigs that don't play the pick and roll well, but with Ibaka and Perkins, well could definitively us Big Al.