That wasn't the strongest attack of naruto.9 bijuu FRS is the strongest attack in the arsenal of naruto.
Then 6 TBBFRS comes at 2nd place.
Anyways i think you don't know how to read manga.
Indra arrow was also the highest shape and nature manipulation jutsu as it was lightning arrow( nature ) and sasuke shape it into an arrow( shape manipulation).
I know how to read a manga.
The highest form of shape manipulation is the rasengan form as said by several characters, among them is Kakashi.
An arrow shape is not the highest form of shape manipulation someone can do.
It is a form of shape manipulation, but not the highest form.
This isn't dragon ball where you have 2 kamehamehas hitting each other until one is overtaken. The 2 attacks didn't "cancel out". "Cancel out" means no explosion. Sasuke's arrow simply exploded when it collided with naruto's measly attack.
Maybe the words cancel out were poorly chosen. I meant one didnt overtake the other.
Sasuke put all his Chakra in it his STRONGEST attack these Rasengans were NOT Narutos strongest it was alll he can do because of how low he was at the time
Yeah, so as in the OP, the bijous that were mixed into his Susanoo made the arrow of really high quality, whereas Naruto didnt had the power to unleash his strongest attack.
Still I wonder why Sasuke didnt mix in some Kagatsuchi in the arrow, seeing he did so in their final clash (Chidori Kagatsuchi vs Rasengan).