In my humble opinion the fights will go like this;
Luffy, Kidd and Law vs Kaido, at first Kidd will face off against Kaido alone and will be decimated, then Law and some of the scabbards will have a go at him and get decimated too. Luffy will arrive and will be assisted by Law, Kidd, Drake, Hawkins, Apoo, Zoro, Carrot and some scabbards, but all of them will be absolutely decimated by Kaido, then the final round will be Luffy, Kidd and Law's final stand against an awakened Yonko who will defeat Kidd and Law and then it will boil down to Luffy vs Kaido. As we all know, the peak of Luffy's strength pre-Ryou is at the level of Oden and Bullet, as seen in the movie Stampede (King King King Kong Gun and King Kong Organ being his strongest moves) but he couldn't defeat even opponents such as Cracker, Doflamingo and Katakuri despite being stronger than them was simply because of lack of haki mastery, but once he's able to master the inner flow of haki and is able to use haki efficiently he'll be at the level of Oden, Rayleigh and Bullet extreme diff; now that he has the advanced CoO and CoA, he's a step above that level but still not at Yonko/Admiral lvl yet, so if he could awaken or unclock G5, then he'll be at Yonko level. So despite him receiving massive help against Kaido, he'll be the one finishing off the Yonko at the end.
Zoro vs King;
The fight will start with Zoro doing pretty good against him at the beginning but once King starts using advanced Haki and awakened hybrid form, Zoro will be in a pickle, and he'll be almost killed by King, but remembering his promise to Kuina, his training with Mihawk and his promise to Luffy to get stronger he'll awaken his black blade and advanced haki and defeat King with a new move😎
Sanji vs Queen;
Just like the Zoro fight, it will start off with Sanji doing pretty good against Queen, beating him around but Queen will whipp out a new virus that will be slow in effect but is a combination of the mummy virus and a CNS virus that will mess up Sanji's senses and make him slower; on top of that Queen will use the hybrid form and beat the living hell out of Sanji. Sanji will also go through his memories and his emotions will intensify making him awaken his Germa genes and beat Queen with an improved hell memories.
Inu and Neko(plus Usopp) vs Jack;
In a similar manner, the fight will start with the dukes performing really good against Jack using regular and Sulong form and defeating him high-diff, but Jack unlike his peers can't control his awakening and will go on a rampage, so he'll make short work of the dukes and be after Usopp for several chapters until he catches up to him and beats him up; Usopp will play dead for a while, telling himself that he's sorry for his friends and that someone else will save them; a tired Jinbei will show up after he just finished his fight with either Smoothie or number 10 of the numbers and will also get defeating, but when Usopp realizes that Jack might kill his friends, he'll tell himself to stand up against Jack and be the brave warrior of the sea he wants to be and stand up to Jack and defeat him somehow