Lol no, if Sabo faces Akainu it's just so Oda can redo Marineford but this time Luffy manages to do what he was unable to do 2 years ago (saving his brother). All the arguments for Akainu vs Sabo apply much more to Luffy vs Akainu.
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That's literally the point of Sabo returning to the story
Anyway,
If Akainu fights Dragon...either Akainu falls or Dragon loses so that Sabo take him down later on