Who do you think will be Sanji's next opponent?
- Kizaru
- One of the Gorosei
- Ben Beckmann
In that order
Just for shits and giggles, this is what I think Zoro's and Luffy's are:
- Shiryu/Blackbeard
- Fuji/Akainu
- Monk Gorosei/Im
- Mihawk/Shanks
It's also possible that you can see other levels to these battles with other Strawhats. Like you can 100% tell Usopp will probably fight his father and certainly fight Van Auger.
There are only 5 Gorosei and Im, but Kong exists, and it's possible there are other WG level members under him as well.
Just things to think about