Obito's war for the Nine-Tails and Eight-Tails chakra was rendered pointless due to new information. The Naruto franchise is infamous for its large number of plot holes and retcons throughout its run.

For instance, Obito Uchiha was crushed by a massive ... Worse, the fight wasn’t fully shown, with only glimpses in Naruto: Shippuden opening song 13, Not Even Sudden Rain Can Defeat Me by ...