And you're suggesting that all four Yonkou are stronger than all four Admirals (Fleet Admiral included), as well as Kong, Garp, and Kuzan?
How would the Marines even exist if the Admirals weren't able to fight the Yonkou? Because, logically, a Yonkou like Kaidou would just turn up at Marineford and destroy it on whim if he was stronger than the Admirals.
Sakazuki and Shanks were in a stalemate
Sakazuki was the one that pretty much killed Whitebeard and took very little damage from him, regardless of illness and old age that at least shows Admirals are very much on par with Yonkou
On top of that, old age etc. seem to be irrelevant, as even in old age Garp and Sengoku are still extremely powerful
Shanks has one arm though and we only saw one clash in which shanks stopped akainu, that was it, to call them even after that brief exchange is silly, tehre isnt enough info based on that alone. Not only that but none of the yonkou work together so obviously they arent gonna beat the WG or the marines. Also 4 yonkou (the captains only) wont beat 3 admirals plus kong and garp and fleet admiral. I imagine that the fleet admiral is equal to a yonkou and thats why i said kong should be equal at least until his stamina runs out. Hes pretty old so i cant imagine him still being as strong as he once was.
And I think you misinterpreted me as I knew you would. In a 1v1 an admiral wont beat a yonko. But obviously the marines have a much larger force than any single yonko crew and if you include garp and all the other new world marines not at marineford(evidenced by vergo not being there) then The wg (includes sengoku garp and kong and all other WG assets) probably has a force larger than all the yonkous combined.
Oh and also a yonkou did show up at marine ford and tear it up his name was WB. They had to assemble a large portion of the marines to stop him and his crew. take his crew away and put a normal amount of marines on MF and he still tore it up. We know that Sengoku tended to stay at MF and also at least one admiral at any time along with multiple vice admirals. One yonkou showing up doesnt mean he will pubstomp MF, he will tear it up and lose because there are many more fighters than him there. If it was only an admiral guarding it, then yes MF would be sunk but we know that isnt the reality of the situation.
The better question is, if an admiral can solo a yonkou then why do the yonkou even exist when there are 6 (3 admirals, + sengoku + garp + kong) admiral class fighters and above in the WG/Marines. Seriously send 3 admiral or above fighters to destroy each yonkou one at a time, but wait that isnt whats happening here is it. The fact is that each yonkou and his crew are strong enough to stand against the marines and for the marines to fight would require the dedication of force that it took to stop WB. Theres a reason when shanks showed up that the marines quit fighting, they would lose too many strong fighters if they did, admirals included.
In other words a yonkou has to be strong enough himself to protect the crew from an admiral in order to survive the new world. If he couldnt then it would take no more than two admirals to annihilate each yonko crew and then that would be it for them.
Fact of the matter is that oda told us through doffy what the yonkos were in comparison to an admiral. Yonko>admirals, its a whole other tier for them in which only a few fighters stand.