^also spiral zetsu increased obito's intelligence, mobility and strength. just look how he slaughtered a large team of mist ninja single handed right after the upgrade. plus in comparison to naruto pre rasen-shuriken and sage mode which he achieved in a short amount of time, obito's advancement is not out of bounds
not only all that, but minato was still better and won the fight. it's not like obito trampled him or even barely won
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