Luffy can't clap Kizaru, stop this joke. Kizaru is competent in swordsmanship to cut Luffy down the second he shrivels up into an old man post usage of g5 or just laser him to death, just because he barely beat Lucci before it happened doesn't mean it would be the same with Kizaru. Even if this happened in the next chapters, I am talking about a pure 1v1 setting with no one else about and luffys ability to create allies, his plot armour can't get in the way. Kaido is too trash to take luffy out in those moments seemingly even though he should have the ability to do so. But like I said Kaido is trash, it is just plot, but it is what it is. Luffy is an inconsistent top tier for a limited time with a serious draw back, and no I don't think g4 with acoc is a top tier, because I don't even think Zoro king of hell sword style with acoc is a top tier either. Not good enough. People like Mihawk, Shanks and Kizaru are permanent top tiers, with the fighting skill to back it up, Luffy isn't consistent. Imagine putting Mihawk infront of Luffy and not expecting him to shred Luffy the second he becomes a sitting duck.
Point is, remove that apparent weakness of G5, then talk. If not then Luffy is Losing to these characters in 1v1 setting, unless you're trying to imply he'd beat them before it happens, like with Lucci.