First of all, an ELITE player should be nearly unstoppable regardless of who he plays with. Parker, Rose and Westbrook are all stoppable. Paul, Nash and Williams are a little more difficult to guard. Take away all the jumpshooters and Parker can't penetrate, then that high fg% everyone uses to justify his weakness in playmaking becomes 'null n void'. Ask him to shoot 50% from the field taking 16ft jumpers, most nights he wont. Paul and Nash especially will burn you if you try that tactic, which is why they get into the lane whenever they feel like it regardless.
And this thing about spacing the floor for DUNCAN really irritates me, especially when a 10/10/2 player like Nazr Mohammed worked wonders for the Spurs and the dude could barely score outside of 5ft. Take away Parker and I am almost sure RJ gets touches in the post, off cuts and in transition. Also Bonner will be of no use anymore either. Then Tim Duncan can get the help he needs.