Akainu or Dragon or anyone else not showing AdCoC doesn't mean much as they have yet to get full fledge fight on screen like Kaido.
We haven't even seen Mihawk using CoC as well right?
What if Akainu has adCoc?
We haven't even seen Mihawk using CoC as well right?
What if Akainu has adCoc?
Dragon has a very good chance because both Luffy and Garp have it.
Yeah Akainu hasn't had a full fledged fight like Kaido and he can have it because Garp had it and most likely Sengoku too and he is an FA. However, no Admiral has shown it so far, Kizaru and Aokiji had a very good chance to show it against Luffy and Garp, two ACoC users bit still it was noy shown. Not to mention that right after Gorosei came and started showing CoC (ACoC wasn't confirmed but very likely). At this point it seems that Admirals wont show ACoC because they have been given busted Logia DFs and this allows them to compete with other top tiers. Fuji has a chance because he doesn't have a busted Logia and he has an SG and all other SG wielders so far have shown ACoC or implied to have it.
If Akainu does have ACoC then he will be on the same tier as Shanks etc.
Another thing is that there is a good chance that simply haki/CoA may not be effective against Admiral logias because we saw in MF how even with hakified attacks from Marco and Vista, Akainu was only annoyed. To actually deal real damage to a Logia Admiral it might require ACoC.