Omdzzz the cap, not once did Luffy use g4 and fs together. Don't even play yourself, Oda knew to restrict Luffy from combining his fs with one of his fastest mode will make the Yonkos look bad speed wise.
You are mad acting like a base Luffy who just took Ragnarok to the nuts didn't do the one thing Zoro wanted to do to Kaido
Let me remind you that Luffy has yet to use his most powerful attack unlike Zoro. Let him pull out KKG, then we'll talk.