Anime filler is anime filler.
Naruto also divided his power 12 ways, never used his Yellow Flash speed, super strength to punch a hole through Itachi or smash his limbs, and never used any chakra arms or Rasengan variants.
Bee stayed in base and forced Itachi to retreat when using his sword dance.
Itachi was under Kabuto's control so he was fighting to the best of his ability, which was greater than it was than when he was alive, and he still couldn't beat them.
Not really... Itachi always held back yet beat 3 of the strongest/smartest people in the series and held back severly for all of them (Orochimaru,Kabuto,Nagato) which all 3 would beat Naruto with little to no effort as shown. So please stop trying to hate and accept Solo King > your favorite character
Show me another character in the series that does compound attacks simultaneously that are executed perfectly and I will show you someone better than Solo King:
HAhahaha!!!
Why hold back against Orochimaru? He was an enemy of the Leaf, was a threat to Sasuke, and was trying to take his body. Speaking of which, Orochimaru was dying and had no killing intent. He tried to take Itachi's body, failed, and left. That's all that happened.
Itachi "held back" against Kakashi and Sasuke too, yet left Kakashi hospitalized and almost burned Sasuke to death with Amaterasu. Itachi was also
trying to win against Kabuto. Not to mention that Kabuto was also holding back and was restricted.
Itachi was not holding back against Nagato at all, had no reason to, and hid from him and ambushed him rather than fight him directly.
Stop wanking Itachi. He has never solo'd anyone except kids and cripples.