At this point the Orange admiral is something that is going to happen one way or the other. Oda could have easily chosen other colors for Fuji and Ryo but he knows that the logical thing for the new wave of admirals is secondary colors that are the result of mixing the primary RGB. Whether that means that Kizaru gets defeated here in Egghead or maybe assumes another important position before the Final War I don't know. And tbh I'm not even sure that the Admiral matchups are as clear-cut as "Zoro vs Kizaru and Sanji vs Ryokugyuu while Fujitora betrays" or even Kuzan not being confronted by the SHs again after Long Ring Long Land whatsoever (regardless of his true allegiances). Hell, I wouldn't even rule out that the original Admiral trio is kept for the Monster trio while the new trio gets left for Sabo/Kidd/Law.
At the same time, Oda is going to heavily expand on the Zodiac VAs. There's no way that he introduces two gag characters that basically originated from the SBS (Chaton and Momousagi) and instead of leaving it at that, he doubles down by making the next marine with an important position introduced to also follow that pattern (Kurouma). Why do that instead to keeping it a one-off? And besides, the most egregious piece of evidence is the actors that have been used so far and Oda's taste in cinema: he loves old Yakuza films with old cool guys like Kunie Tanaka and Bunta Sugawara, and also samurai movies both new and old like Zatoichi with Shintaro Katsu. And he loves Akira Kurosawa as a director and many of his films. So there's NO WAY IN HELL that he's not going to use Toshiro Mifune, arguably the most famous Japanese actor of all time, as a basis for someone, whether present or past. I'm willing to bet anything.
Chaton means Brown Pig.