But you still have to accept the fact, indirectly Naruto united the Shinobi world.
Indirectly, Hiruzen is the strongest shinobi because he was trained by Hashirama and Tobirama. It doesn't work like that.
It's A certainty not A prediction, you're A fan of the Naruto manga yet you fail to see the manga your reading...
What kind of idiot do you have to be to think that "Let me tell you what's about to happen" is not a prediction?