What will happen to Kaido after his defeat, I can see several scenarios:
1. He can just escape and go somewhere far away Enel style. Or Blackwargreymon style in Digimon 2 anime.
Then he can come back again near EoS, but like Blackwargreymon, he won't be an enemy amymore, but too bad he's gonna get used as hypetool and killed by the new villain (Imu). Well, at least he died in middle of massive war. Way bigger than the whole circus show called Onigashima raid.
2. He can die Zephyr style. CP0 in the island will move by contacting the Navy or World Gov, to summon Buster Call alike or SSG to Wano.
Kaido is seen starting to respect Luffy more since their first encounter when he Baguaed Luffy to 1 hit KO. After his defeat, not farfetched to think he will respect and like Luffy way more, so he will sacrifice himself against Buster Call or SSG to buy time for exhausted Luffy and friends to escape the island.
If Kaido pulls a heroic sacrifice like this then Yamato will also start to view his daddy in different light, in their last moment.
3. He got captured and sent to Impel Down just like majority of past villains. There he will meet up with Doffy and planning a prison break together.
1. He can just escape and go somewhere far away Enel style. Or Blackwargreymon style in Digimon 2 anime.
Then he can come back again near EoS, but like Blackwargreymon, he won't be an enemy amymore, but too bad he's gonna get used as hypetool and killed by the new villain (Imu). Well, at least he died in middle of massive war. Way bigger than the whole circus show called Onigashima raid.
2. He can die Zephyr style. CP0 in the island will move by contacting the Navy or World Gov, to summon Buster Call alike or SSG to Wano.
Kaido is seen starting to respect Luffy more since their first encounter when he Baguaed Luffy to 1 hit KO. After his defeat, not farfetched to think he will respect and like Luffy way more, so he will sacrifice himself against Buster Call or SSG to buy time for exhausted Luffy and friends to escape the island.
If Kaido pulls a heroic sacrifice like this then Yamato will also start to view his daddy in different light, in their last moment.
3. He got captured and sent to Impel Down just like majority of past villains. There he will meet up with Doffy and planning a prison break together.