Of course he can use his right eye but that would be stupid since he needs that eye. But i'm wondering if he can use the rinnegan? it's not a sharigan but the rinnegan evolved from the sharigan but will it go blind since it was a ems that turned into the rinnegan? Is it still eternal since it's not his own eye? Does it stop being a ems since it's now a rinnegan? or is it only something Madara can do since it's his eyes?