It's simple
Either Akainu deserves his FA rank so the 5B is a great representation of his worth as there is only one FA
Or he doesn't , meaning he's a fraud.
I don't believe Oda portrayed him as the marine Buggy personally
Mihawk: “How much should we give the Fleet Admiral?”
Crocodile: “5 Billion seems fair, but Sakazuki isn’t really worth that bounty. But since he’s FA he gets it anyways.”
 
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