Kaido probably possesses enough strength to beat Akainu without transforming, but if he does use his dragon form, Akainu won't even scratch him. When Kaido transforms into his dragon form, he gains even more inhuman durability because of his scales.
Yamato was capable of holding back Kaido and that's all an Admiral has to do. Kid and Law took down Linlin, two Admirals would decimate her. Once that happens, Three Admirals at the same time vs Kaido would destroy him in a minute. Admirals also has greater teamwork than two yonko.
Kaido is the strongest creature, meaning that his Zoan Devil Fruit amps him to be the physically strongest character in the series.
Blackbeard had an opportunity to fight against Akainu while negotiating the relinquishment of Bonney, but the Yonko decided it was better to retreat. There is no doubt that after the time-skip, Blackbeard has become much more powerful, and he can defeat Akainu without any problems.
Akainu can definitely damage Kaido, because of his advanced-grade Busoshoku Haki and his Magu Magu no Mi, the highest offensive power among the Devil Fruits. What are the reasons people think that Kaido from One Piece is stronger than Akainu and Aokiji combined?
It is a known fact that Kaido has lost to his fellow Yonko and the Navy a combined 7 times and been captured a total of 18 times. While Kaido might be the strongest in terms of raw strength, there are definitely those who can beat him a fight. Write for Us!
Garp Is Considered To Be One Of The Strongest Marines. Also renowned as 'Garp The Hero' and 'Garp The Fist', Monkey D. Garp is a Vice-Admiral of the Marines. Being their strongest known member in history, there's no denying that Garp is capable of taking on Kaido.
Someone with the Clear-Clear Fruit can just go invisible and attack Akainu whenever his guard is down, and if the user has Haki, they will be able to harm Akainu even if he transforms his body into magma.
Akainu's weaknesses are drowning and caught off guard by Seastone.
Zoro has been constantly improving at a rapid pace in order to fight the monsters of the New World. He has a lot of potential to still improve and become one of the best, however, there is no way that he is beating Akainu.
It is safe to say that Garp is more than capable of fighting on an equal footing against the Yonko. Whitebeard, one of the Four Emperors of the Sea, was a threat equal to the other Yonko even during his old age.
Akainu was easily the most brutal and domineering admiral. He claimed that anything done to pirates was justified and proved equally ruthless toward all perceived enemies of the World Government. During the Buster Call in Ohara, he was personally responsible for ensuring that none survived.
Kozuki Oden and Roronoa Zoro both gave him permanent scars with their swords attacks. Keep in mind that neighter fighters have unlocked the ability to forge "black blades." Mihawk should be strong enough to scar Kaido as well. It should also be noted that Kaido considers Shanks to be his equal.
Garp is easily the most powerful Vice Admiral in the Marines, and rivals or exceeds the power of the known Admirals and Fleet Admirals.
Roger used advanced forms of conqueror's haki as he imbued his sword with conqueror's haki and clashed with Whitebeard. He also used advanced armament haki for more powerful sword attacks. Additionally, Roger possessed the observation haki, thus, making him the strongest haki user of all time in One Piece.
One Piece's weakest Conqueror's Haki user is undoubtedly Eustass Kid. He's shown no signs of training or skill with the technique, as well as showing no signs of Advanced Conqueror's Haki. While it's likely he eventually becomes more skillful with it, Kid currently ranks as the weakest user of the form in the series.
Oden is the first person to gravely injure Kaido and fight with him on an equal level. Though Oden suffers defeat, he is by no means weaker than Kaido. Oden would have definitely won against Kaido if not for the deception.
His involvement in the God Valley incident gave him legendary status. Garp's insane haki is no doubt his biggest weapon and Smoker would not be able to survive his Haki based attacks. So, it should be an easy win for Garp.
Although the current Luffy has gained quite a lot of abilities over the time, including the advanced Haki, the Gear 5, and many more, he still cannot be as powerful as his grandfather Garp.
Before awakening his Conqueror's Haki, Zoro wasn't even as strong as a top Yonko Commander, let alone a Yonko. Although he did fight Kaido and even managed to earn his praise, which is quite impressive, it was pretty clear that Zoro wasn't anywhere close to him in terms of either power or skill.
The Reason why Law can't kill Kaido by simply taking his heart out and stabbing it - One Piece. It's very simple. Law's Ope Ope no Mi devil fruit grants him no cutting abilities. Law needs to be strong enough to cut and kill someone to perform his surgeries.