And if Muu hits a explosive clone of Itachi? Hitting a lightning clone is legit but Itachi's isn't? U_U
Well the difference is that Itachi is always around his clones. He doesn't possess techniques capable to conceal his original self like Kakashi, so Mu should be capable to notice him and his double without problems U_U
And Juubi/ Rikudo Madara. Juubi is natural energy, Madara is a human with the Juubi sealed inside him, giving him the power of the six paths/Rikudo's Senjutsu. Minato sensed it in base. So interpretations hold no weight.
Nope, either Madara or Obito when they become Jubi's Jinchuriki, they have his body(physical energy) and chakra.
Besides,
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Sage Mode Naruto who was in KCM earlier said
"now that i think about it, when i sensed Jubi's power earlier, it felt like natural energy"
It means that the only time he managed to feel Jubi's chakra was when he was in SM at this moment:
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He couldn't feel his chakra inside Obito
And yeah, any Jutsu needs Chakra. Whether Jinton or flying. Even if he can hide his presence while invisible, if he does his next Jutsu, he can be detected and seen, as he uses Chakra.
Every jutsu needs chakra indeed. It's for that reason i said he can't use jinton while invisible. However, no he doesn't need chakra for flying. The flying technique is only a technique they(Onoki and Mu) use when they reduce their weigth, something that can be done to someone else(Akatsuchi for example). But after their weight is reduced, they move on their own. No chakra needed. You can even notice that Mu was fighting Onoki in the air(invisible) until Gaara noticed his presence with his sand sensing
Itachi can use Genjutsu on various ways, with eyes, with the finger, with crows even on long range and on flying opponents. He can use feints. Etc. There are enough tactics for someone like Itachi left.
Sure he can, but he actually has to target his target first, which would be difficult against an invisible man.
Besides, he is a sensor, so he should have no problem in detecting minor genjutsus and break it(considering sensors have great chakra control in general).
Unless it's a Kanashibari no genjutsu at least, i don't see him struggling in breaking Itachi's genjutsus if it came down to it