I like the G-5 guys already. They're like pirates...that are marines.
Are we sure that's his deal?
I mean, maybe he's a Kappa that ate a Lionfruit.
After all, Zoan fruit isn't the only explanation for a talking animals. Abalom had a lion head too, and his was purely surgical.
I don't think he has much of a say in the matter. If the Marines promote him, they promote him.
And as an Admiral, who's going to tell him he can't chase who he wants.