Where is it said that? The only thing we're sure he didn't use is Perfect Susanoo. It was in the contrary heavily implied that he DID use Susanoo
OT: Nice thread as usual. True that Muu would definitely cause a lot problems to Uchihas in general. That's why i personally put him above all Uchihas except Madara for obvious reasons
Here onoki asks susano with a question mark and later acknolwedges that he has the ms [
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]. If madara did in deed use susano even its early stages against onoki and mu, onoki wouldn't exactly be surprised to see it.
Later here [
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However his surprise to see susano even its first states that he didn't know madara had susano.
That's nice and all but why are you comparing Madara to the likes of Itachi? Unless you're actually implying that Itachi falls under the same category as Madara. Furthermore, we fully don't have any information of how that fight went.
Muu would definitely trouble Itachi or Sasuke to a huge extent.
What im saying is that a lot of ninja's would lose to madara no question however these ninja's would at least make him use susano even if its not the final stage its early stages.
As i said when a character gets little screen time and they show they trade mark techniques people get the perception that its absolute, however if they get more screen time the manga will show more of its weaknesses.
Examples if itachi or obito died shortly after they revealed amaterasu/tsukuyomi or kamui we would think these techniques were absolute, however as they got more screen time and the manga showed more of their techniques we can clearly see that, they are powerful techniques however not absolute.
People have the perception that because a technique hasn't been shown much of a weakness its invincible. That just means the user have limited screen time. Obviously everybody has their perception and ranking however its rather clear that though he would give either bro's a fight he is an inferior opponent to either.
Btw mu wasn't young, he was in the same generation as tobirama and that generation and the hashirama/madara generation isn't a big gap at all. The kakuzu, knew well enough of the kin/jin bro's who knew well enough of tobirmara's edo tensei technique. Now kakuzu as we know fought hashirama. Wouldnt be surprised if he knew mu