We now know the strongest kingdom of the world is elbaf...
So, is there a possibility that Elbaf's King/ Prince Loki is yonko level?
(note: yonko level is a measure of strength not meaning they have to be pirates)
What i want you guys to consider is that BigMom's crew and island arent the strongest... yet they are that strong...
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My opinion: YES... the King could be yonko level... and has a strong DF and He protects a road poneglyph... that is why pirates have not yet found one...