Oddly, the article does not say what role he played, just that he was imprisoned in Vienna for his role and freed by the allies after the war.  I especially like his blas? acceptance that the war was inevitable.  That is one of the enduring myths about WWI, there was nothing inevitable abot it.  The July Crisis was very similar to several other Crisis of the first decade of the 20^th century.

There were something like ten conspirators that lined the route.  It was actually luck that Princip managed to get a shot off.  If the Archduke had not changed the route to go to the hospital and see the victims of the grenade attack and if his driver had not gotten lost, it is probable that the assassination would not have happened at all.  If nothing else, it proves that happenstance has as much role in making history as deliberate acts.  That is something that historians tend to forget at times, especially when they write as though events are preordained.

There is no probably about Oswald's shot, it was like holding a natural Royal Flush and a winning lottery ticket at the same time.  Possible, just not very probable.