Since Luffy is in a serious battle vs Imu now, and seriously wounded already, meaning the fight will get even more serious from now on so the question is how Akainu vs Luffy can be exciting?
We see Aokiji (Akainu's equal) also fought in a serious battle vs Old Garp, and even then Aokiji needed Shiryu's stab and Pizarro's island power forcing Garp to keep fighting, so they could capture him. So basically mean Akainu level power such as Aokiji's wasn't enough vs Old Garp, so how it can be enough vs Luffy who is fighting Imu right now.
This might be similar to after Luffy defeats Kaido, he fought Kizaru. It didn't feel like downgrade because Kizaru had Saturn backing him up then other 4 Gorosei also showed up.
Now if we assume Luffy will return and fight Imu, his fight vs Akainu won't be exciting at all.
It could be like Luffy vs multiple opponents; Kizaru+Saturn example.
Is Luffy vs Akainu will be a long, death match like 1 vs 1 battle? Or will other characters interfere so it won't be that serious?
I personally like Sabo or Dragon fighting Akainu more, but Luffy might also fight him then they can separate in a team battle.