'06-'07 was the season he became a full time C. Sure, they pretended Oberto and Elson were the C's, but they pretend everyone opposite him is, from Jeremy Richardson (
http://www.basketball-reference.com/...801210CHA.html) to Diaw.
Never really understood the never ending "Is Duncan a PF or a C?" debate. Quite clearly, he's a C, who primarily played PF his first nine seasons because the Spurs had an all-time great C already in place when he was drafted. So what? Was Rodriguez not the greatest SS of all time because he was over sized for the position, had a unique skill set for it and later moved to 3B?
1. Duncan
2. Malone
3. Garnett
4. Barkley
5. Nowitzki
6. McHale
7. Gasol (Let's not pretend he's too not a C, who's masqueraded as a PF for the majority of his career)
8. Pet
9. Hayes
10. Webber