I was just pondering, since i was watching the battle with masked "Madara" vs Minato and some questions came up.

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At the bottom left panel, we see "Madara's" left arm oozing off. But it seems that Obito's left side werent crushed during his nap time under the boulders.

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And here at the bottom right panel we see his left arm intact.

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Sure he was bandaged up, but not amputated like his right arm. Why is that?

This makes me think that it wasn't Obito during his battle with Minato.