Kaido was phenomenal feat-wise, Oda will be careful with Akainu’s image as well considering that he carries a ton of narrative weight (killed Ace, leader of the marines, connection to Dragon) even compared to characters like Kaido. Kaido and BM both serve the same purpose, yonkos and obstacles for PK race. They are both not even the most important obstacle in that regard, Teach is. Akainu will be key in the final war as the central antagonist within the marine faction.
Oda has a choice to make with akainu. Narrative importance or powerhouse and I very much believe it's more in tune for oda to choose narrative.
No character gets good narrative and strength. Kaido had no real narrative he was all strength, orochi was the narrative.
Big mom was clearly narrative driven and that's why she looked ass so fucking often
Kizaru was all narrative, he didn't actually do anything that lasted other than kill vegapunk which actually fucked his mission more than if he just left vegapunk
Aokiji and garp was pure narrative, shiryu had to put his cards in for that to work out in their favour.
The only top tiers looking good Rn are the gorosei and that's only until the SH find out their gimmick