I don't think anyone is even supposed to solo a character , that's why they are in teams , in the sasuke vs itachi , itachi had it planned , gaara vs diedara , diedara was shooting on top of his bird , diedara vs sasuke , sasuke didn't exactly deafeat diedara just escaped death , sasori didn't win , you see my point here so far no one really soloed anyone in the series and by solo I mean one on one with defeat not running away or being cut off and naruto soloed pein since Hinata was useless really , she was just there to motivate and naruto was using Kurama's chakra but Kurama wasn't fighting like what B does with Hachibi , I can't really remember a fair one on one fight with defeat .