Where were Duncan and Pop system when he led Argentina to an historical gold medal? oh wait, they were on one of the teams he beat. When he was an Euroleague champ and MVP? Watching from TV. He always has been a leader, and made his teammates better, and he did it by being humble, not making it about himself, which is absolutely the ultimate compliment. That Argentina team will always be lauded by their teamwork, it was never "built around his strengths", another terrible cop-out. Quoting Kobe on this:"He took on a huge responsibility, and elevated everything there".
Heck, even off the bench with the Spurs, he made absolutely flawed players look good (too long a list: Oberto, RMJ, Blair, Ayres, Neal, Beli, Bonner, Tiago, Patty to an extent...) and he didn't do it going heroball, but actually getting everybody involved and making them feel important. That's the epitome of making teammates better. A lot of those guys left the Spurs and never been anywhere near the same.
He's too old now to be the kind of guy that commands the attention he used to. But he didn't used to use that attention to shower himself with stats, but to actually win, no matter who ended up putting the ball in the basket.
EDIT: This has nothing to do with Tony, who I think also made some of his teammates better. Obviously, he has played with Timmy a lot more minutes, so it's difficult to really appreciate. If anything the argument that it was Tim, not Manu/Tony that made players better, probably affects Tony way more than Manu (not because it's necessarily true, but because he shared a lot more starters minutes with Tim).