I think the entire idea of Conqueror being an ability only certain people are born with is retarded. Even with that said it is entirely possible to be strong as fuck without it. It's clear Akainu had a brutal life. Combine that with an S tier devil fruit, S tier determination, and big talent it still very much makes sense to me that Akainu is top tier motherfucker even without being a Conqueror. I think the same thing applies to the other admirals, just to a lesser degree. If you still think Kizaru has Acoc, you are one silly goose. But ya as I said Conq being even a somewhat a unique thing is very unfortunate.