I mean, I don't think that Kizaru losing to luffy would be a huge hype loss, since Luffy is a Top Tier too and also the protagonist. Sooner or later they'll loose to Luffy and that's fine.
He can recover for the Final War with pretty much the same hype.
You all sound like Luffy is gonna crush him, but an extreme diff battle is pretty acceptable and the hype still.