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I feel like this episode pretty much confirms what a lot of people have been saying about Madara's body actually being one of the Zetsus.
Since last week he told us you need both Senjuu and Uchiha DNA to use Izanagi, that Madara took his DNA during their fight, and that Zetsu army is being made with DNA taken from that time.
It makes sense then that the Senjuu power he's getting to use the Izanagi is coming from a Zetsu body that he's currently residing in(and of course, also explains the gooey white mess when the 4th was blowing his arms off).