Pretty easy to guess actually, given by their personality and future matchups.
- Akainu: Only one with CoC
- Kizaru: Equally efficient in CoA and CoO.
- Fujitora: Obvious
- Ryokugyu: As his exact opossite most likely CoA
Fujitora vs Zoro since Zoro is a CoA freak but "weaker" in observation while Aramaki gets Sanji who needs to polish his CoA.