I don't thnig Usopp and Nami is getting another fight, i see Chopper getting one and Brook too.
Brook will defend Robin from CP0 agents and Chopper will fight the last Numbers members.
Jack is big fucking question mark. Let's just make the assumption:
Beast Pirates Executives = Strawhats
Everyone else = Everyone else
Apoo and Hawkins aren't Executives. Peros and Fukurokuju work for Big Mom and Orochi respectively. That means the only matchup breaking this rule right now is Inu vs Jack. Technically Yamato vs Kaido too but in that case there are pretty decent reasons to believe she's going to be a strawhat, so it works for the time being.
The biggest question I have right now is if Jack beats Inu, then who does he fight? If we follow this "rule", then it could mean one or several Strawhats take him on. Right now, Usopp, Chopper, Brook, Nami, Jinbe, and Franky are all theoretically "available" for that fight as it stands. Yamato could "eventually" be sent down from the roof by Luffy, prompting her to fight Jack. Jack "may" head back to the performance floor with Queen and King if he wins, prompting characters lime Chopper or Franky to be involved.
Things like that, but I really wonder what's happening there. Unless of course, Inu just wins....