i was thinking when the 9 tails attack the village back when minato was hokage. and discover that tobi was controling the demon fox ..... and he seal the 9 tails in inside naruto i think he did this to help naruto win against tobi or madara he said it him self
but people think that he was not strong enough to go one on one with tobi or madara ..... but think about this the demon fox with out a host is the most powerful being in naruto so if u can control the demon fox the only thing that can beat u is another person that can control the demon fox too like the 1 hokage thats why madara lost to the 1 hokage . but if tobi or madara would it decide to go one on one against minato with out the demon fox..... minato probably was a master on the sage mode probably better than jiraya and with his speed and the rasengan minato would won on a 1 vs 1 fight with tobi madara
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but people think that he was not strong enough to go one on one with tobi or madara ..... but think about this the demon fox with out a host is the most powerful being in naruto so if u can control the demon fox the only thing that can beat u is another person that can control the demon fox too like the 1 hokage thats why madara lost to the 1 hokage . but if tobi or madara would it decide to go one on one against minato with out the demon fox..... minato probably was a master on the sage mode probably better than jiraya and with his speed and the rasengan minato would won on a 1 vs 1 fight with tobi madara