i think Sanji and Jinbe will both be low top tiers by then , so at least they both will be required to beat Ryokugyu .
Chaton is Franky's opponent imo , and CP-0 will be present at Mariejois .
Luffy and Zoro are the only ones soloing Admirals ( Akainu and Kizaru )
Luffy vs Akainu
Zoro vs Kizaru
Sanji , Jinbe , Usopp ( ? ) vs Ryokugyu
Franky vs Chaton
Robin vs Momousagi
Brook vs Drake ( ? )
Nami vs Tsuru
Chopper vs John Giant
the 11th SH vs Coby or Smoker ( ? )
well assuming he wouldn't have surpassed his dad by then , it'll still require Sanji and Jinbe to beat Ryokugyu imo .