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.
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