It's headcanon that the dude, who inflicted the only knowing LARGE scar on preskip Luffy and killed Ace in front lf him, is the opponent of Sabo who INHERITED Ace's will?
Are you seriously asking that? Ofc it's massive headcanon.
Not to mention that Sabo has the inferior element, so he is still absolutely FUCKED against Akainu.
What is even his business with Akainu when Luffy is the one getting his payback at Akainu for killing Ace in front of him and giving him PTSD.
It's funny how Luffy didn't give a fuck about what you are talking about, especially when Tama mentioned Ace and he said he was killed in Marine Ford War without mentioning Akainu's name or talking about taking revenge.
Not Dragon, but Akainu who has grudge against him since he mentioned Luffy always with Dragon's son.
Oh, so Luffy didn't give a shit about it, so that's why his scar was aching after he heard AKAINU'S NAME in front of him? Sure, that must mean nothing, right? Luffy can talk and react about it calmly because Tama wasn't bringing up the dude responsible for Ace' death. It wasn't a trigger. When Jimbei brought up Akainu, that was the moment when his PSTD kicked in and his scar was aching. But sure, that was for nothing and means shit, right?
They all have reasons for, what's more funny is the fact that in the same time Oda showed Sabo as the flame emperor, Akainu was drawing talking seriously about how he wouldn't let things change in his Era.
So it's headcanon to say the guy who has the MOST REASONS to beat Akainu due to the ON PANEL LIFE EVENT which Akainu inflicted on him because there are two other characters who could fight Akainu with less reasons?
How about the possibility that Sabo starts the fight with Akainu, gets his ass kicked but Luffy responds in time because this time, he's powerful enough to protect his only brother? You don't seem to understand about the fact how is it like for Sabo to hear from Ace' death when Sabo was having an amnesia and Ace dying in front of Luffy due to his powerlessness. Sabo could have prevented it but Luffy didn't. In fact, Luffy COULDN'T. That's the whole point. He was starting to give up on his dreams because he was feeling WEAK. He was there, even in front of Ace, but he couldn't save him, he died in front of him.
The fake narrative, that Sabo is fighting Akainu, is Yonko fan agenda anyways since people don't want Akainu to face EoS Luffy or near EoS Luffy and holding his own against him.