King's flames is not a living creature. It just flames in shape of a dragon. Kaido and Loki actually turn into dragons, living creatures. There's a huge difference between the two. Logia do literally become their element.
People are making this out to be more difficult than it needs to be because they don't want to give Zoro the credit he deserves. Zoro fought Kaido, a dragon. Zoro fought a character who is harder to damage than Kaido, King. Zoro created a technique capable of defeating King. Put it together and you have a technique that is able to defeat dragons, like Kaido, with one swing. It's that simple.
Seastones weaken df uses but don't take away their df power. Luffy nearly passed out but his body didn't stop being rubber like.
Logias become their element, but a human version of their element. It´s why you can still harm them with Haki, when you obviously can´t literally hurt a natural element with Haki, you´re getting past through the element to the real body. As far as I know, seastone does the same thing by literally nulifying your fruit. Zoans should not have their defenses while in seastones, which should apply to Loki as well. Feel free to prove me wrong if it´s been implied otherwise. The same applies to Zoans, Loki and Kaido are not real Dragons. Like, there are real dragons in OP, and they´re much smaller, some of them even have less powers, etc...
It´s not about downplaying Zoro, it´s about the fact that editor comments should not be taken seriously for powerscaling lmfao. And How are you complaining about things being unfair, when you´re arguing that Loki is less durable then Kaido based on what happened while:
he was completely chained up in seastone, unable to defend himself at all, we´ve clearly never seen the real defense of his fruit, and if it even exists
and against a completely unknown variable, Shamrocks Cerberus Zoan, which we know nothing about, power wise.