i bet a white zetsu is hiding (maybe even just sitting 
) behind kabuto and watching his moves. we have seen him do this many times without the people he was spying on noticing.
even if no one is watching kabuto, madara knows that kabuto intended to use nagato and itachi at some point because he showed madara the bodies.
but i agree, madara shouldnt have any clue about itachi having control of his own mind/body again.
btw, where did madara get another 3 PAIRS of the rinnegan? i remember him NEEDING nagato's eyes, when he fought konan. now he suddenly has 6 new rinnegan eyes (one for each jinchuriki/path controls). i wonder where he got them from. also, it wouldve been cool if he was able to give a rinnegan (or a pair of them) to each of the 100k zetsu's. they immediately become a force thats much harder to deal with...by that i mean, all 100k being able to share each other's visions (not actually using the rinnegan jutsus in the battlefield). xD
