Depending on if the rest of WB pirates are present, we now certainly have more than enough characters to matchup against the 2 Yonko.
- 10 Strawhats
- 6 other Supernova (lets assume they all get moments to showcase their abilities; and assume Apoo, Hawkins and Drake eventually betray Kaido)
- 9 Scabbards (Neko and Izo are back, lets count them there since Kanjuro is bad)
- The 3 main Division Commanders (Marco/Vista/Joz, the rest will just have panel moments if present I'm sure, perhaps allies like Whitey Bay are here)
That's 28 good "main" characters in the least right now.
- 2 Yonko
- 3 All Stars
- Yamato (lets assume he's bad/powerful for now)
- 5 Tobi Roppo (discounting Drake)
- 9 Numbers
- Smoothie
- 6 Veterans (Pero, Daifuku, Snack, Campote, Amande, Oven?)
- Orochi
- Kanjuro
- Mimiwarigumi Leader (lets assume he's the only member to get significant presence but who knows)
- Fukurokuju (assuming the rest don't get significant presence)
Thats 31 bad "main" characters in a way, though you can add other Minks/Yakuza Samurai/WB Commanders or Allies to balance. Additionally, you could add more BM children (there are ton of other notable members) to establish more fights/presence towards the alliance.
Even if the Yonko don't fall this arc (I've been guessing this for some time now), there are still enough characters to have a massive war otherwise.
Excited to see what the 8 Number looks like.