Obito probably got damaged during the bombs. Izanagi completely alters reality. This notion is fully supported when Danzo got burnt into Oblivion, but came back in the form before he received this devastating mortal wound. Izanagi will reconstruct the reality exactly at the point it was initiated.
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- Gets burnt completely.
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- Reappears in exactly the same manner when Izanagi was initiated.
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- Crushed to a maroon paste.
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- Reappears in the form when he received the mortal wound.
As for the rest of your points. Laughable as usual. Izanagi ONLY alters reality for the moment it's initiated/used. It won't make the individual reappear, or alter their reality before that moment:
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- Danzo uses the seals, initiating Izanagi.
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- Receives the mortal wound.
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- Reappears in the EXACT form when it was initiated.
Here is more:
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- Initiates Izanagi, here.
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- Sasuke is tightening his Susano’o’s grip here, and blood is gushing out of Danzo’s mouth.
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- Is crushed completely, but Reappears in the form when he initiated the technique. There are no blood lines under his mouth. What else have you got? Not to mention he released/used the technique quite a while before he actually received the mortal wound.
First his shoulder catches fire:
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. Almost completely engulfed by flames here:
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. The flames are still spreading as he's screaming -
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. Yet he appears with his clothes in perfect condition here:
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. Where are the burn marks on his shoulders or anywhere on his clothes?
As Obito shows zero signs of clothes damage, it can never and will never be Kamui.