>>104387288He was at first.
But then he orchestrated Atlantis's attack on the surface so that Aquaman would finally take the throne.
Aquaman hates him for playing him like that, but still reluctantly asks him for advice in his cell.
>>104387334That's not a very good description. Vulko genuinely likes Aquaman and has nothing against the surface. In fact, he hates the nationalist/extremist Atlanteans.
He kickstarted the conflict precisely because he knew Aquaman would stop it and take the throne to prevent any further conflict with the surface.