sasuke did not solo the jubbi...BUT he dam sure could do the same amount of damage by himself lets break this down shall we... narutos chou odama rasenshuriken was the biggest rasenshuriken in managa history the rasenshuriken is deadly on its own so adding such size to it makes things incredibly dangerous ill give naruto that... but if sasuke were to shoot 3 or 4 of the arrows he shot at the jubbi they would pierce the jubbi and the flames would spread to around the same radius the combined attack did you cannot deny sasuke has way more fire power than 1 single enton arrow remember the zetsus...
think of it like this... i make a campfire and the wind is blowing the fire is gaining strength due to the wind but the fire eventually gets so big it burns down our camp now would you say the wind mixed with the fire burned down our camp? no you would say there was alot of fire and it burned our camp naruto used sasukes amount of fire and amplified its radius but the same thing would happen if sasuke simply USED MORE FIRE hope i cleared a few things up for you
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now what isf sasuke choose to use this technique instead of the arrow? he could spam this move across the jubbis body and do even worse damage than the rasenshuriken arrow combo.. so the sasuke fans have a huge point with the whole solo the jubbi since sasuke is capable of inflicting the same amount of damage on his own although the jubbi is far from finished of course only an idiot would think its actually the end of the jubbi.. think of it like this... i make a campfire and the wind is blowing the fire is gaining strength due to the wind but the fire eventually gets so big it burns down our camp now would you say the wind mixed with the fire burned down our camp? no you would say there was alot of fire and it burned our camp naruto used sasukes amount of fire and amplified its radius but the same thing would happen if sasuke simply USED MORE FIRE hope i cleared a few things up for you