I don't know why people think that Madara kill a clone of Sasuke. It wasn't a clone, and it wasn't a genjutsu. Madara can easely counter genjutsu, and it can't be a wood clone or ink clone or any clone. Remember when Madara meets Naruto? He can easely see that he was a clone, and it was a shadow clone the only clone that is a forbidden clone. he didn't see Naruto clone just once, but twise. Immediately sees Madara that Naruto was just a clone. I really think that it is Sasuke who's stapped by a blade throug hes heart. But I really hope that he survive this some how.