No offense, but you are overhyping a bit here on some of those points.
> He never speedblitzed Hashirama, that was a clone, and Naruto is currently in KCM mode, not BM.
> Why should his durability be higher? Having a greater control over his abilities doesn't boost his durability.
> Since when was the Juubi's bijuudama country level+?
> The non-charged bijuudamas he's using (though we've only seen them once or twice), though strong, don't appear to be as powerful as the ones seen before.
For now, I say:
Scenario 1, Bleach wins.
Scenario 2, Obito wins.
> Hashirama's clone would still have the same reaction speed.
> Right, that was KCM Naruto.
> Because of the idea of compression/surface area, Giru. The massive power of the Juubi is concentrated to fit into a much smaller, humanoid-sized figure. That power is now focused rather than it being expansive, as the Hachibi said. With the power getting smaller due to it being more compressed, physical strength and speed rose. If those two rose, then of course durability would rise too. Things get bigger and more spread-out, they get easier to wound. Things get smaller and more compressed, they're less easy to wound. It's all surface area mechanics and what the Hachibi said. Right now, the Jinchuriki of the Ten-Tails is invincible against the most destructive attacks in the Narutoverse, which would be the Juubi's TBBs.
> How about ever since the Juubi shot a TBB that bordered on country level back in its second form? The third form's TBB would be on another level than that. It really isn't that hard to figure out.
> Regardless of what it looks like, It's still mountain level+ at the bare minimum. Yamamoto isn't going to survive that attack.
Also going to throw in that Obito should still be able to use Kamui, so he still has dimensional intangibility.
> No, it wouldn't. Clones have been shown to be weaker on multiple occasions throughout the series. Madara casually stabbed a Hashirama clone with his susano, do you think he could have done that to the original?
> Not necessarily, but your logic is relatively sound so willing to let that go.
> No, it didn't, the Juubi has yet to do anything country level.
> True, Yamma would be KOd/murdered by a Juubi bijjudama, which is why (combined with his speed and black chakra hax) I definitely give it to Obito in scenario 2.
As for Kamui, yes, he should be able to, but we still have yet to see it, so for now I'm going to doubt it (if we're honest, he doesn't really need it).