NO show me a part in the manga where it's explained .
YEA but anime is studiot pierrot not kishimoto
Where is it stated? oh from your imagination
YES kakashi's team fought him as if he was at 100% ,they coulnd't know about the 30%, at the end they could beat him that's the most important.
he was not confident in their first fight ,itachi was very fast but kakashi did good job with clones before that he save kurenai from the explosif clone.
at this time of fight kakashi was not bad .it was impossible for kakashi to win the first fight but he was far to be an idiot since any ninja would subit same against an unknow and rare ability such as tsukiyomi.
he didn't get owned by susanoo , he countered it with kamui ,and yes that was the payoff to spam mangekyou despite he always been saved and healthed by juugo karin suigetsu tobi and zetsu.even if he was not tired , he couldn't beat kakashi since he was almost blind.
kakashi said himself that he wanted take sasuke but naruto didn't let him.