To be fair, it's implied that it takes all of the marines+ shichibukai to stand up against all four of the Emperors. And since we know that the Emperors will NEVER work together... well, let's just say that since we don't know the power of any of the other emperors, it's quite possible that in a 1v1, an admiral and a yonkou might be very closely matched (other than Whitebeard, but you've already seen my thoughts on that)
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