It seems for Oda , he sees Gear 4th is a fodder for a Real Top Tier started from Mid Top Tier like Oden and Admirals and going above , if we are real you can see how Kaido wasted him easily that he killed him or how Kizaru handled him easily ; that's why the real Top Tier form for Luffy is Gear 5th and I bet Oda's quote when Lucci said I don't recognize Luffy is a Yonko when he used that form would get debunked ; that's the first thing that i got to understand as for how Luffy is beating Kizaru I don't see it either ? Luffy himself said he's Old Rayleigh Level and with how Feats are shown with Gear 5th ; dude is struggling a lot dude already used his Giant Form and didn't do shit if you verify what oda showed with Kaido; Luffy used it against KAIDO and didn't do shit afterwards Luffy used his own Gear 3rd like moves and then BG while we have Kizaru didn't use his swordmanship nor awakening form and Luffy already his high forms's moves ; Things ain't looking good for luffy for real as for me him using adv CoC doesn't mean shit if he doesn't land it Overall Kizaru is doing multi tasks while holding back and focusing on his mission ; Good Portrayal for Admirals .