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Madara created zetsu. He specifically created BZ to be his will and to watch and assist obito. However what madara didn't know was that BZ was not his will at all but kaguya's. It isn't a stretch to say that all the zetsu's who initially were thought to follow Madara's
will are actually working for kaguya. This shows how much kaguya was influencing madara since even his own creations which were suppose to act on his own will actually serve her. It also likely that she is the one that coaxed madara into absorbing the shinju. And finally since she was the original user of IT it isn't impossible that she was the one who manipulated madra into wanting to cast it.
Given the above one can say that kaguya has been using madara all along and now that his usefullness has expired, it is now left to BZ to dispose of him