It’s pretty obvious luffy’s relationship with his crew is unique to the other emperors and theirs. It’s also different than Roger’s with luffy clearly not having a Rayleigh relationship with anyone in the crew. Rayleigh being put on a pedestal in comparison to the other Roger Pirates and the strawhats having no hierarchy beyond luffy himself. Tho zoro and sanji due to their strength do usually stand out more with them being tasked to protect the crew and take out strong subordinates when luffy himself can’t
With all that being said while luffy doesn’t really have a “Rayleigh” I do think zoro and sanji are there to fill that void together
Zoro and Sanji representing both Rayleigh and Gaban as well as Oden and Rayleigh
Zoro obviously being the Rayleigh + Oden and Sanji the Gaban + Rayleigh in this case
Same with the beast pirates
Zoro and Sanji representing both king and queen as well as Yamato (oden) and king
Zoro obviously being the king + Yamato and Sanji the queen + king in this case
Beckman more likely than not being a mix of zoro and sanji same way Rayleigh and king kinda are
Similar case with killer and bepo. Tho it being a lot more obvious and in your face with killer lowkey being the closest to a zoro + sanji fusion. Sharing similarities to both characters
Also yes Zoro is stronger and more special than Sanji. Which is why I compared him to oden and Yamato and compared Sanji to gaban and queen