I think I'll keep calling him Madara to avoid confusion. I was skeptical to use that name because I'm starting to believe he actually isn't Madara. But I meant a combination of the two names he used, Tobi and Madara = Tobira or Madabi. Or maybe even Tobidara or Madarabi.
Tried and failed. We never got to see what's inside that casket, as LunaticCat said.I dunno about that. Oro DID try and summon the 4th.
I never got the fact that although Oro's hands were sealed, he could perform techniques again after he replaced his body. It's his soul's arms that were sealed. So if he'd transfer to a new body, his soul would magically be restored?