Naruto Shippuden 391 see’s Madara making his move as he uses Zetsu and eventually Obito’s powers to bring himself back to life which he promises to take the Beasts and initiate his plan. Obito is at the end of his life, after being extracted from the Ten Tails he won’t die but he traded his life for Madara’s so he’s going to eventually die, thus Zetsu takes this opportunity to use him right up until the end.