Imo if we speak only about Kaidou then my money on Luffy/Law/Kidd/Hawkins/Apoo against him… but if you are talking about kaido's crew, then I bet it's the rest of each supernova's crew + wanokuni + the gladiators introduced right there(kanokuni / cavendish/ barto...).
But TBH I still don't know about XDrake and Moria they seem to have a great grudge against Kaidou.
If you want my opinion which yonko will be out first, then I don't know. IF Oda were to introduce each yonko alone, then it will take a lot of time, just think about it If SH are going to take kaido, then I expect at least 120-150 chapters (about 15volumes) same thing with BM (30 to 40 volume for them both...).., Then what about the other islands? Adventure? Vegapunk? Revolutionnary? 7thSchichibukai? ALL blue? Viking? Elbaf? the other yonko? and more and more, it will take another 60volumes or more...
That's why I believe that Oda may take down two yonkos at the same time to rush things... Hence a time I was thinking maybe Oda will do an arc with the 4 yonko involved? to rush up things? like for example now kaido is probably going to be mad at SH and Law for destroying the factory, then we have BM will probably be mad when the gold luffy gave her will explode, also maybe the KHA alliance will aim for Shank's head? and BB with Burgess involved he may be interested in the turning of events and wait till a yonko is out to take his DF (Kaido?)/territories
also don't forget when a yonko is out there will probably be a replacement for him, so maybe a new enemy (if not ally) to SH...
I hope this NW will not turn into only figh against yonko and marine... I want to see new islands, adventure...