As the "strongest creature", Kaido's ability to single out is beyond doubt, and he has stunned him many times in the battle with Luffy, which shows that there is still a gap in strength between the two. But with the update of the latest plot of "One Piece", we found that Kaido, who has always had the upper hand in the battle, was actually suppressed by Luffy, and even appeared to "vomit blood" and "roll his eyes", why can Luffy suppress Kaido in a short period of time? In fact, it is not that Oda Sensei deliberately let Luffy "open and hang", but there is another reason.

Wheel wars are a key factor
Since the beginning of the Ghost Island War, Kaido's grandfather has not rested, and he is always in a state of battle. Battled against nine heroes, supernovae, Yamato and others in turn, and opened an unprecedented "wheel war". It should be known that the opponents that Kaido is fighting against are a handful of strong people, with strength that cannot be underestimated. Take Yamato alone, Yamato has a strength equal to Ace many years ago, with the growth of age and the rich experience of actual combat, the strength of Yamato is at least the "imperial vice level", but even so, in the face of Kaido can only end hastily.
The repeated attacks of many opponents have caused Kaido to be injured to varying degrees in the battle, and it can be said that Kaido's ability to fight until now is a "miracle" in itself. Although the "wheel war" is the victory of Kaido, it is indispensable to consume a certain amount of physical strength, and even indirectly weaken the combat effectiveness. Therefore, the wheel war is one of the factors affecting the decline in Kaido's strength.
Trolling affects physical fitness
Except for the wheel war, Kaido is always dragging the "ghost island" to sink. According to Momonosuke and Yamato's brief description of the flame cloud, both creating a flame cloud and controlling a flame cloud require physical energy, and moving such a huge terrain as ghost island naturally consumes more energy. Kekaido can not only continue to control the sinking of the ghost island, but even perform this act in battle, which shows the strength of Kaido's grandfather.
As mentioned above, even if Kaido is strong, "dragging the island" will also affect physical fitness. Therefore, Kaido's strength decline is inseparable from the long time of dragging the island, and the same is the incarnation of the dragon Momosuke, who does not even have the ability to control the flame cloud, and can only try to drag the flame cloud, which proves in disguise how terrifying Kaido's physical ability is.
Kaido was drunk
Then there is Kaido's "drunkenness". Although Kaido himself said that drunkenness does not affect his combat effectiveness, combined with his battle process with Luffy, he will find that the flaws after drunkenness are more obvious than before, and at the same time, their reaction ability is slightly inferior to Luffy's. Although Kaido himself has an amazing defensive blessing, it is also difficult to face Luffy's attack with high-level domineering entanglement, so drunkenness is also a factor in the decline of strength, but it is not critical compared to the above two points.
Luffy, who has mastered the hegemony, does have imperial strength
In fact, today's Luffy does have imperial strength, especially after mastering the "high-level armed color domineering" and "overlord color entanglement". In terms of ability alone, Luffy may not be as good as Kaido in every way, but he does have the capital to fight Kaido, because he has the key ability to defeat Kaido's defenses, that is, he is a high-level domineering. This, combined with the flexibility of its own fruits and its excellent combat IQ, allowed it to gain the upper hand in a recent duel.
In general, Kaido's strength declined due to factors such as wheel wars, dragging islands, and drunkenness, while Luffy had a significant increase in strength after mastering the hegemony, and the combination of the two eventually became the current situation. So why do you think Kaido was suppressed by Luffy? Please comment in the comments section.