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We saw Kaido damaging G5 Luffy with blunt attacks, just that he needed to pull out his stronger attacks (initial named attacks were treated as a joke by Luffy).
Kaido was damaging Nika Luffy, not giant tankman mode Nika Luffy, there is a gulf of difference.
There is no indication that Kaido would be able to seriously damage that form of defense if he doesn't use that lava dragon finishing attack.
What do you mean they were not meant for burning opponent?
They burned Jyabura, Wadatsumi, Queen.
Sanji literally says IJ is so hot, that it's made possible only due to exeskeleton + improvement in armament haki[
Jabura was the only time an opponent was complaining about burns, after that, the narrative context of diable jambe was never about burning opponents, the flames on Sanji's leg was always used as an illustration of how powerful the attack was being.
Likewise, as the narrative context for Zoro's attacks, Zoro is never cutting his opponent in two, even if he cuts a giant golem in two, he cuts a dragon's head, he cuts the Kraken's tentacles into several pieces. , but he can never cut his opponents in two, there is no logical explanation for this, but that is how it is written narratively, the way Oda finds it appropriate to do with his writing.
Sanji's attacks have always been about kicking harder, the hotter the attacks, the stronger his kicks will be, for example:
If a kick from
Base Sanji is 60 shades of strength
So a kick from the diable jambe is 100 tons of force
So an Ifrit kick is 200 tons of force