So yeah..... Obito had made 4 tbb's...... and Madara is the only one who was still inside of the barrier.
But Obito is using chakra ''erasing'' techniques, and Madara's Perfect Susano'o can't do anything against that.
So wouldn't it be logical for him to be dead? (again)
But of course PNJ protects Madara from being erased off of the very planet itself.