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When Zoro proclaimed "that flame is like magma!!" during the confrontation with King, he was undoubtedly referring to the flames as extremely hot. His comparison with magma suggests that the flames were equally scorching, if not even hotter. The author, Eiichiro Oda, likely intended to emphasize the exceptionally intense and lethal nature of King's flames. Therefore, Zoro's phrase can be interpreted as a way to assert that these flames were truly at the same temperature level as molten magma, making them a formidable threat and justifying the choice of the magma analogy.
Now, consider this: Kaido can envelop himself in these flames that are like magma and have the same, if not higher, temperature. What difference does it make if he covers himself in magma or with these flames? None, because both have the same temperature; they are relative in that regard to the extent that even Zoro pointed it out.
When Oda answered a question in the SBS about the strongest in the world, a question in which Akainu was mentioned, but Oda brought up Kaido to answer it, thus placing Kaido above Akainu, it becomes more plausible when it comes to discussing the strongest living creature in the world. Oda basically had in mind to make Kaido a tough matchup for Akainu, and indeed he is. Kaido has shown us that he can withstand Akainu's main power and remain unaffected while doing so.
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