I think the early phase of this final war will be the conflict that happens in Elbaf(aka Ragnarock) and I believe Kuzan will play a pivotal role to Kizaru as one of the secondary antagonists.
The second phase of the war will be the Revolutionaries invading the holy land and clashing against the marines and WG but mid conflict I believe that the marines and Akainu will try a military coup against the CD and will attempt to take the 2 other factions, Akainu will fight dragon after the former takes out the Gorosei in a calculated plan and while they’re fighting Imu shows up and it becomes a 3 way battle.
Simultaneously another conflict will happen between the 4 emperors over the red poneglyphs
After this comes the final phase where an injured Imu and 9 God knights head to laugh tale and the straw hats do the same
The second phase of the war will be the Revolutionaries invading the holy land and clashing against the marines and WG but mid conflict I believe that the marines and Akainu will try a military coup against the CD and will attempt to take the 2 other factions, Akainu will fight dragon after the former takes out the Gorosei in a calculated plan and while they’re fighting Imu shows up and it becomes a 3 way battle.
Simultaneously another conflict will happen between the 4 emperors over the red poneglyphs
After this comes the final phase where an injured Imu and 9 God knights head to laugh tale and the straw hats do the same