I suspect we will see shishi or izuna be revived very shortly. I don't think the ones who know everything are actually the hokages, as they are too biased towards the leaf.
excellent theory + reputationMaybe Sasuke will not be pleased with Hashirama's answer and summon his father Fugaku with the last Zetsu?
I made a thread asking the same question ... apparently people think he was absorbedSpeaking of the 6th zetsu, did it disappear in this chapter. Some people said it disappeared and Jugo wasn't holding it down anymore.