Some people seem to believe that during the final war Sabo will take care of Akainu to avenge Ace as he's basically Ace 2.0 having now replaced the other Luffy brother...
However, I don't believe this will happen. Instead it will be the usual Luffy taking care of him.
1) Motivation: Luffy has actually more reasons to fight Akainu than Sabo. While Ace is brother to both, he was killed in front of Luffy's eyes, and Akainu was also about to kill Luffy himself, leaving him with a giant scar. In fact, for all we know Sabo never even met Akainu.
2) Organizations: Sakazuki leads the Marines and their job is to take care of pirates. Who's the biggest pirate of them all? Our dear Pirate King Monkey D. Luffy. Sabo on the other hand is the #2 of the Revos, and their direct counterpart as far as WG organizations are NOT the Marines but CP0.
3) Plot importance: while on the pirate side Blackbeard is clearly being depicted as the ultimate rival for the throne, on the WG side Akainu currently stands unrivaled as the big bad guy. Right now it's not even close. He killed Ace, the MC's brother, put Whitebeard on the deathbed, and is now the Navy Fleet Admiral that will clearly stick to the WG side until the end due to his absolute justice. The only one who could overshadow him is Im. But we don't know yet if Im has any martial might. Even if he does, Akainu still remains a character with great accumulated plot significance that makes very hard to see someone else beside Luffy taking care of him. Would you actually expect to see Akainu v Law, or Akainu v Kid at EoS? I guess not, it's most likely Luffy or Sabo, and I do believe that considering the stuff mentioned above plus Oda's MC focus it will be Luffy.
Sabo will focus on CP0 instead, Lucci is right there waiting for him, and if Dragon is still in the mix at EoS there can be a CP0 boss for him as well.
EDIT: to clarify, I can still see Luffy going after Gorosei/Im (if they are fighters) after Akainu. I'm just saying that Akainu will go down to Luffy toward the end of the story and not to Sabo.
However, I don't believe this will happen. Instead it will be the usual Luffy taking care of him.
1) Motivation: Luffy has actually more reasons to fight Akainu than Sabo. While Ace is brother to both, he was killed in front of Luffy's eyes, and Akainu was also about to kill Luffy himself, leaving him with a giant scar. In fact, for all we know Sabo never even met Akainu.
2) Organizations: Sakazuki leads the Marines and their job is to take care of pirates. Who's the biggest pirate of them all? Our dear Pirate King Monkey D. Luffy. Sabo on the other hand is the #2 of the Revos, and their direct counterpart as far as WG organizations are NOT the Marines but CP0.
3) Plot importance: while on the pirate side Blackbeard is clearly being depicted as the ultimate rival for the throne, on the WG side Akainu currently stands unrivaled as the big bad guy. Right now it's not even close. He killed Ace, the MC's brother, put Whitebeard on the deathbed, and is now the Navy Fleet Admiral that will clearly stick to the WG side until the end due to his absolute justice. The only one who could overshadow him is Im. But we don't know yet if Im has any martial might. Even if he does, Akainu still remains a character with great accumulated plot significance that makes very hard to see someone else beside Luffy taking care of him. Would you actually expect to see Akainu v Law, or Akainu v Kid at EoS? I guess not, it's most likely Luffy or Sabo, and I do believe that considering the stuff mentioned above plus Oda's MC focus it will be Luffy.
Sabo will focus on CP0 instead, Lucci is right there waiting for him, and if Dragon is still in the mix at EoS there can be a CP0 boss for him as well.
EDIT: to clarify, I can still see Luffy going after Gorosei/Im (if they are fighters) after Akainu. I'm just saying that Akainu will go down to Luffy toward the end of the story and not to Sabo.
It will be glorious watching the tears of Yonko/PK wankers when Akainu goes toe to toe with PK Luffy that just defeated WSM Blackbeard 



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