Controversial Luffy is fighting Akainu

[Ice devil slayer]

Akainu vs luffy is so obvious
How can anyone deny that

 

[Durableguy]

Akainu can still very much fight Luffy, Dragon, Sabo or even another Marine like Fujitora. The problem with the Luffy one is still that he’s got no chance of being the final villain while still being important enough that he should be in the final arc. If he fights Luffy he’s either a mid arc fight, which makes him look bad, or somehow goes down before the final war, which makes no sense.

Or maybe the final war is quite different than you expect.

It's Blackbeard vs Luffy vs Marines(Akainu) for the first part. They get to Laughtale. The marines are obligated to stop Blackbeard and Luffy from getting to Laughtale. Blackbeard has to fight Luffy to become PK. But Luffy overcomes.

Then it's the WG. Gorosei and Imu and Holy Knights vs revos and SHs.