why wouldnt he be already...he is more consistent, the best at his position...Hell he was the best at his position pretty much all of his career. Same cant be said about kobe...sure if you throw in commercialization/controversy/mass appeal...and other off court attributes no question he should be ahead of duncan. But from a strictly on court assessment, Duncan is ahead...hell even shaq is ahead. Some may say no...but did he not dominant at his position for most of his career? Wasnt he arguable the best center of the league for a strong decade? Wasnt he the key/primary reason for 3 championships? Was he not clear cut the best at his position...(some may say yao, but lets be honest thats just racially bias, and the fact he was a rare find)
This cannot be said about kobe, at one point you couldve made an argument about tmac and ai...or at the very least a close second. Sure you had your rasheed, kg, and cwebb...but duncan time and time again proved he was head and shoulders above the rest.