they didnt die for him tobirama died for the entire team which included hiruzen and hashirama's death is still unknown so dnt assume things that u have no proof of, and oro didnt restrict them from talking, tobirama or hashirama could have easily said to hiruzen u let us down especially tobirama who thinks he knws best but neither said anything of that sort...the leaf was the most stable it had ever been during hiruzen's term, he faced oro attacking the village, hashirama faced madara and kyuubi attacking the village, tobirama incited a civil war, caused friction between other countries
hiruzen's was konha's Marcus Arelius who started rome off in the Peace Era which was called Pax Romana