I will start this from after the Kuma flashback, it.
First Kuma regains his consciousness momentarily so we see his reaction to Luffy becoming Nika, he is the main opponent to Saturn awakening AdCoC against him which causes real damage to him.
Kizaru quits the Navy, we see him, Luffy, Kuma, Sentoumaru, Bonney and Lilith(VP) fight against Saturn who is revealed to be PK level and a haki monster with regeneration.
They win with team effort but Kizaru dies at the end and Kuma goes back to being a vegetable.
When Saturn dies, we see a flashback of him since he was young, becoming a God’s Knight and finally being promoted to Gorosei.
A young Saturn walks towards the afterlife and meets young Kuma where an ideological clash between them happen and Saturn smiles at the end, saying that Kuma had won this fight and that he is a hero who can save others.
First Kuma regains his consciousness momentarily so we see his reaction to Luffy becoming Nika, he is the main opponent to Saturn awakening AdCoC against him which causes real damage to him.
Kizaru quits the Navy, we see him, Luffy, Kuma, Sentoumaru, Bonney and Lilith(VP) fight against Saturn who is revealed to be PK level and a haki monster with regeneration.
They win with team effort but Kizaru dies at the end and Kuma goes back to being a vegetable.
When Saturn dies, we see a flashback of him since he was young, becoming a God’s Knight and finally being promoted to Gorosei.
A young Saturn walks towards the afterlife and meets young Kuma where an ideological clash between them happen and Saturn smiles at the end, saying that Kuma had won this fight and that he is a hero who can save others.