Lol
Either this or Fuji, definitely. Imo it depends on if Oda will make Fuji a complete ally or an opponent still in the war. If Aokiji is undercover, then there are some good matchups for the "Top 5".
Luffy v. Akainu
Zoro v. Fuji/Kizaru
Sanji v. Ryokugyuu
Jinbe v. Kizaru (or no one if he is meant to be a Zoro opponent; this matchup only because of his involvement with Arlong/Fisher Tiger)
Yamato v. Aokiji (Ice mythical zoan vs Ice Logia)
Either this or Fuji, definitely. Imo it depends on if Oda will make Fuji a complete ally or an opponent still in the war. If Aokiji is undercover, then there are some good matchups for the "Top 5".
Luffy v. Akainu
Zoro v. Fuji/Kizaru
Sanji v. Ryokugyuu
Jinbe v. Kizaru (or no one if he is meant to be a Zoro opponent; this matchup only because of his involvement with Arlong/Fisher Tiger)
Yamato v. Aokiji (Ice mythical zoan vs Ice Logia)

Akainus partner