That is IF Celtics would have sourround him with the supporting cast spurs did. Spurs are at the top when it comes to scouting and getting the right kind of players. Celtics management is eh.................. Celtcs with Duncan would make the playffs every year, no doubt. But I dont know if Celics could assemble a team like the Spurs did to compete for champinship each and every year. Duncan should be really really thankful he is surrounded by probably the top management in NBA.
Don't forget he also picked up David Robinson, who might have had something to do with the 36 game improvement.