Okay so we know that madara was definitely killed at the VOTE. And I also know that he activated izanagi to revive himself. So, if madara died, wouldn't that mean that his cycle of reincarnation ended? If so then that means implanting asura's chakra in himself would've been useless since he didn't have anymore indra chakra. And since he wouldn't have been able to mix the two chakras together, then he wouldn't have been able to awaken the rinnegan.