I'm starting to think Ben Beckman doesnt have coc . the way Oda treat conqueror haki make it look like something unique to shanks which mean Ben beckman is likely just coa monster.
advanced coa + gun insane fire power, ben can literally geerate nuke from his gun.
he doesnt have futur sign eithet, so probably just very good observatio like zoro.
yet ben bechmann is admiral level expecialy now that we know the RHP have the weakest fleet so the ore member should be very strong.
this mean zoro doesnt even need coc to be amiral level, his base is likely already up there.
coc put him confortably above ben beckmann as someone who have that rare ability.
-ben bechman top tier CoA
-Marco top tier invulnerability
- Katakuri top tier observation
-shiryu top tier devil fruit even more valuable in his awakened form than blackbeards by making you intangible.
-king top tier durability.
every top commenders have at least a top tier ability but just lack in the other arrea.
unlike them zoro doesnt lack in any state and has adv coc that make you emperor level.