Nah, just quit the marines like that, after all that he did, would not be good. Akainu is his brother but eventually one or more gorosei could ask him about what he did at Egghead, he could even be called by Im. Most likely Oda will keep him in the naftaline at least for an arc or 2 now, afterall the last time Kizaru did something before Egghead it was Marineford.