stop trying to refute the manga with lame excuses
Obito had alrealy manipulated him, he didn't need Zetsu for that... Saske was already on his way to avenge his brother.
and what was Zetsu doing here? trying to motivate his other half??
he pretty much acknowledged him...
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Hebi Saske > Pre-SM Nardo
SM Nardo > Hebi Saske
MS Saske > SM Nardo
don't see where's the doubt here!?!?
also MS Saske with susano'o and enton >>> Hebi Saske... Hebi Saske wouln't get passed susano'o and would get killed with amaterasu or enton arrow...
but unlike SM Nardo, he doesn't even have chakra sensing or danger sensing to avoid any incoming attack from MS Saske, so he would go down even easier...