Madara is not Tobi.
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kisame assumed madara was the fourth mizukage , after all fourth mizukage yagura was actually manipulated by madara/tobi ... so you can assume that madara was the real mizukage and yagura was just a puppet ...
Tobi (Madara) isn't dead yet.
Tobi is Madara
probably not because Tobi is madara uchiha in disguise
Tobi/Madara killed her with a metal pipe.