I kind of figured it out but it's so fucking confusing. Basically, I think his skin can be superheated into being Seastone, which is when the flame is on outside his body. When the flame is off outside, he's using the flame to increase his metabolism/blood flow (kind of like Gear 2) and increase his speed and power, but it makes him more vulnerable, because he's no longer hardening his skin.
So, the Seraphim are a nightmare because they're top tier Pacifista + Lunarian Genes + Warlord Genes. Even MORIA caused Kaido problems once upon a time. The Seraphim are going to keep getting stronger, too, they're still kids.
So, the Seraphim are a nightmare because they're top tier Pacifista + Lunarian Genes + Warlord Genes. Even MORIA caused Kaido problems once upon a time. The Seraphim are going to keep getting stronger, too, they're still kids.