If you'd like to argue the point that Splitter and Anderson are not going to be in the rotation this year then go ahead.
Again, feel free to argue otherwise, but Splitter and Anderson would make 6 guys in the rotation this year.
On top of that the Spurs also used several of their picks to acquire players who went on to help the Spurs win rings. The 1998 1st rounder brought Antonio Daniels to town. The 2000 1st rounder got Steve Kerr. The 2002 pick got Speedy Claxton. The 2003 and 2006 picks got Nazr Mohammed. Considering the roles those guys played in helping the Spurs win rings, I'm more than okay with the return on those investments. Afterall, the whole point is to win championships, right? Or is the point to just see how many of your own draft picks you can put on your roster so that you can pat yourself on the back and say "look how awesome we are at drafting"?