At first I thought that the person in front of Sauske was Kabuto, but that has become doubtful for me. While he still fits the profile given, Karin should have been able to recognize him, assuming they crossed paths once since Kabuto rarely left Orochimaru's side.
Madara is so boss that he took out Guy and Lee without even trying, lol. Although I feel those six path tools will come back to haunt him. They are also in Tenten's vicinity, is Tenten gonna save the world ??!!
Minato's flashback proves that Kushina has extremely powerful mother's intuition.
Black Zetsu swooping in to steal the other half of Kurama was a surprise and now Madara has shown up to take his other eye back with an added bonus.