I disagree.
Duncan, for whatever reason, continues to bang out incredibly consistent seasons year after year. Look at him now; he dominating his way to a fifth NBA Finals appearance in what has been an outstanding career. KG, on the other hand, remains dominant on only one side of the floor. He is defense is incredible, even at age 37, but unfortunately, the energy he exerts there takes away from his offense.
When healthy, Rondo is better than Parker. Both are great guards who I think often times get forgotten in the best PG discussion (for me, Rondo is third when healthy, and Parker was breaking the top five this season; if not for injuries, he would've been a legit MVP candidate).
Ginobili and Pierce are very similar in that they are big-game players that make big shots and are incredibly crafty. Both have regressed on the defensive end, but their smarts on the other end are what make they so dangerous on offense. I'd take Pierce just because I think he's better than Ginobili defensively right now. Plus, he's a Celtic!
Kawhi Leonard is one of my favorite players in the league, and the thing that's scary about him is that he's really just a defensive specialist for the Spurs right now. He brings a lot else to the table in rebounding, shooting, and passing, so I think he's got a great future ahead of him. Right now, though, I'd say Green is a little bit better, if only because his offensive game is much more polished, and he's an animal in the open court. His perimeter defense is solid as well.
Those are the core guys. When I look at the role players for both teams, I think SAS's are far better.
I'd take Green over Bradley because even though his defense isn't as good as Bradley's, he's bigger and can shoot really well. Plus, I haven't seen a full season of Bradley starting. I consider Lee to be a worse version of Green.
Terry and Neal are very similar in that they are microwave scorers who are terrible on defense. I'd take Terry because of the experience. Crawford is also like Neal, except that Crawford sucks.
I compare Sullinger to Dejuan Blair. They're both undersized big guys who have health issue, and are really good rebounders. I like Sullinger because he has a post game, even if Blair is more athletic.
I guess Bass and Diaw are similar in that they are faceup, undersized PFs, except that Diaw is a better passer, and has a little bit of a post game. I like Diaw because he moves the ball well.
I don't think there's anyone on our roster who is similar to Splitter.
Overall, I don't think we can be like the Spurs and continue to contend because our supporting cast isn't as good as theirs'.
Their stars are also more consistent than ours.