My theorie is that Kaguyas Will got transfered to Black Zetsu while Madara was using the Gedo Mazo to stay alive.(thats when he created Black Zetsu)and Black Zetsu is not Kaguya only her Will nothing more, he is still weak and got no extra powers (Nothing more then Obitos body and sharingan).
But if he transferred his body into Madara to try to take control of him, then Black Zetsu will win because its the power of minds and like stated Balck Zetsu is Kaguyas Will and is probably stronger than Madara.(But still Madara is mad with power and is crazy so maybe he goes on a rampage and is trying to resist Kaguyas Will and we will have a mental struggle with the 2 strongest characters in Naruto.
So hopefully Madara doenst give up and die instantly, By his mindset and ambitions i dont think he will just give Kaguya his body and powers. (Becasue he have a god complex and has a insane mindset) And we cant forget that he actually have the Juubi inside him(we dont know if it got fused with the god tree) So it could possibly be a struggler with even 3 minds (The Juubi doesnt have a intellect but it still want to be free)
And the rest, well i really like the dreams(made me smile

) Kiba being Hokage, yea in your dreams. Sasuke being a **** to Sakura and Kakashi was not needed, it fits his personality but still they are not completely useless, Kakashi still has his intellect and Sakura can heal wounds directly (well Sasuke and Naruto doenst need it but still)
Well it was a long post but hopefully i got everything i wanted to speculate on and the rating 5/5