I'm leaning to wb since he is the one who is around rocks the most
Like when he beat Loki and wb told him to stop it
Also roger respeted wb the most due to his strength
cant see the weaker guy being the right hand men
Considering both are a liar that similarly saying they don't care about Xebec and never follow him but they are following him lol, and I'm using Zoro and Sanji as example we can conclude that :
WB as "Right hand man"
- Cuz so far he actin like what Zoro did - the type of guy who never follows any order too, 2nd strongest too, Sometimes become the leader too when it's needed and later WB become a captain and Zoro sometimes mistakenly thought as Captain of SH
- I didn't see any specialty except WB being a leader when the captain isn't around and a combatant like Zoro
- Shiki being mad at WB because he act like he is the Leader when Rocks isn't there is Peak Sanji mirroring.
Shiki as "Left hand man"
- Shiki also act like what Sanji did in this chapter, the 3rd strongest of the crew sorry Jinbe
- the type of guy who sometimes didn't listen to his captain too, but can become Vocal of team like when he stop The skirmish between Xebec and Kaido, just like Sanji when he stop Luffy being emotional and wants to sent Ussop off just by being mad which is Childish from both honestly
- being mad at WB acting as a leader