@Cin
Do not forget that Yuri can also use the Shinsoo to increase his speed (because ToG Statistics Amplification in general does not only increase AP and durability, but also the speed) and Yuri's Durability is greater than her AP, because Karaka's Damage Counter which had absorbed the damage from her attacks through the black and golden Baangs he wore and used the Rain of Darkness against her, and Yuri's body was almost scratchy and some parts of her clothing torn, meaning she might agonize her own attacks with some scratches and the Shinsoo also increases her Durability and this will make it difficult for Luffy to be able to do any damage she feels in pain, but it's not impossible for Yuri to feel pain, it's only difficult.
Also Yuri has the advantage of experience in fighting and intelligence, since she was a Regular who became a Ranker in 200 years and later became a High Ranker in 100 years, and her age is 618+, and Yuri like other Regulares who have turned Rankers in the past have gone through situations or battles of life or death like any Regular, since it is said that among 100,000 Regular only one turns Ranker, that is the experience and intelligence goes to Yuri since to become a Ranker, not enough power , but intelligence and cunning to climb the Tower.
@Teon
Not only does Gear 4th increase speed, but also Gear 2nd increases Luffy's speed, remember his fight against Blueno? Before using Gear 2nd, the Blueno was paired Luffy base in speed, but after using the 2nd Gear, Luffy started bluestone Blueno several times indicating that Gear 2nd increases speed, but Shinsoo enhancement also applies Speed not only in AP and Durability.
And also after the timeskip, Luffy in character never used Gear Stacking (okay it was against Moria he used it on before the timeskip, but he does not use it in character after the timeskip... as far as I remember)
