Many here are saying that it was the role players who failed, i would say that Duncan and Ginobili were far below their averages this series, specially in play making, and that exposed how poor Kawhi and LA are as play makers, most often than not they made poor decision on offense, and the fact that Parker is also a ty play maker and that Diaw was MIA exposed this even more.
Truth is during our last runs, Tim, Tony and Manu have been the most important players as they allow an offensive flow no other core produced league wide, specially Manu and Tim, who were maybe the best in passing out immediately after creating a team advantage,obviously peaking in 2014. In this regard, Kawhi and LA are years away of developing that team chemistry, and without that chemistry role players rarely succeed.