zetsu is madara
The one that is standing next too obito now has to be a zetsu clone of madara because his copying ability can bluff others.
To piggy back what someone said earlier this year, since madara trust zetsu, its possible for him to pose as a clone that madara made against the kages, and to copy his chakra so that he can go stall naruto, guy, kakashi and killer bee from pummeling obito uchiha.
My hypothesis is not solid enough but from what I seen of zetsu, its possible. Defeating all 5 kages would be no easy feat for madara unless they are really fodder ninja compare to him.
I'm just telling you what I think. Any agree?:shrug:
If you disagree, come at me