kaido's armament is on katakuri's block mochi level, which is not that strong
What do you mean by hardening katakuri? do you really know what you are talking about?
After the WCI arc, after Luffy defeated the katakuri, his hardness (COA) was probably equal to or greater than that of the katakuri, and if you say no, Luffy trained COA in UDON, until he reached "level 3", completely higher than its COA in WCI, there are no comparisons, luffy hardening> Katakuri, this is indisputable after UDON.
KAIDO with a casual blow left Luffy more rigid than the katakuri with his MOCHI blocks, Luffy when receiving the blow from KAIDO already had the COA superior to his version in WCI and the COA superior to KATAKURI, screaming and feeling pain.
Coating level:
KAIDO> Luffy> Katakuri, how can you put KAIDO's casual blow that made Luffy scream and cry, Luffy with a stronger COA than KATAKURI's COA, on the same level as MOCHI's blows? Do you really know what you're talking about?
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There is no difference whatsoever from what BM did to what Luffy did, people are trying to complicate the easy, and trying to use the justification that ADCOC does not touch the user to confuse it with ACOA, and to say that BM, does not have ACOA.