1. Fact:
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2. Kido protected his Body and skin with a Spl materiel that Blocks all chakra and is not chakra related. Raikage's armor is in fact Chakra related.
FRS and the 3rds armour is Chakra on chakra by force. Gentle fist goes beyond Attempting to damage a ninja's out sides. They use chakra to destroy chakra and with the ability to inject chakra accurately it is a spl form of fighting that does just that, no matter how tough your outsides are.
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For example; Every ninja has their Chakra points exposed similar to sweat glands. But only the Hyugas can see these "hole's" and
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the insides through the
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! FRS simply creates countless tiny wind blades that attacks the Outter body till their is nothing more (basically outside till the inside). Hyuga's inject and attack the insides at the points exactly avoiding the skin and anything else.
To put it simple:
Gentle fist could turn off the Ninjutsu chakra armor
Gentle fist attacks his inner organs through the
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(which every ninja have exposed btw). When the Armor is turned off.
Kidomaru didn't use chakra armor nor anything chakra related to defend from neji.
But it doesn't matter since The 3rd wins this match up being discussed most likely anyways.