Kyuubi unlimited and op power> sharingan and incomplete susanoo
Naruto had plenty of help and prep time against pein. If hinata didn't try to cape for him he would've been captured
And and Kakuzu was already half way there by time he got to the fight
manga you reading when Naruto arrived Kakuza was going to kill Shikamaru's sidekicks. Naruto used summons as help, who else in the leaf offered support
Hinata helped him just as much as Karin was helping Sasuke. Because without her healing him he dies at the Kage summit.
Plus don't act like before he got the Mangekyo he wasn't being bailed out by the curse seal
the Sharinghan and every other eye cheat code have shown to be just as effective a life saver as the Kyubbi chakra. Sasuke copy many jutsus, has an arsenal of forbidden jutsu he learned from Oro (that he never uses
) variations of chidori, high level of chakra also but relies mainly on the Sharinghan. So again who did Sasuke beat without relying on the Sharinghan since u want to talk about the Kyubbi chakra.