Help on some fact checking please
Hi, I'm working on a fanfic and need a bit of help on fact checking. My memory is a bit fuzzy, especially regarding all the things that were revealed during the Fourth War (on top of skipping a lot of it...), so I'd appreciate some help please. I'm putting the three questions behind the cut, because there are SPOILERS regarding Tobi's real identity, Rin, and general Madara stuff.
1. When Obito attacked Konoha (the Kyuubi and Naruto's birth incident), was Madara already dead? My understanding is that Madara was already dead, but I couldn't find the confirmation one way or another.
2. Do we know how long it was (or at least the closest estimate) between the time Obito "died" and when Rin was killed and then Obito attacked Konoha during Naruto's birth?
3. Was it said for sure one way or another, whether Obito was the only person who could revive Madara? Could Zetsu do it on his own without Obito?
Thanks very much in advance for any help!
1. When Obito attacked Konoha (the Kyuubi and Naruto's birth incident), was Madara already dead? My understanding is that Madara was already dead, but I couldn't find the confirmation one way or another.
2. Do we know how long it was (or at least the closest estimate) between the time Obito "died" and when Rin was killed and then Obito attacked Konoha during Naruto's birth?
3. Was it said for sure one way or another, whether Obito was the only person who could revive Madara? Could Zetsu do it on his own without Obito?
Thanks very much in advance for any help!

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And thanks for explaining what you meant about Zetsu, Obito, and Madara. That was what I was thinking too, but I just wasn't sure if it was actually talked about some more in the manga (as in the exact way Obito was supposed to do it and whether Zetsu could do the same).
Thanks again! :)