So it’s pretty clear that post rocks the men leading the way for the marines and pirates respectively were Garp + Sengoku and Roger + Whitebeard
It’s clear that at least on the marines side Sengoku and Garp were clear of the rest of them
All that being said what if the marines and rocks pirates at the time paralleled each other at the time. Each main member of rocks having their own marine rival
- Xebec - Kong?
- Whitebeard - Sengoku
- Shiki - admiral?
- Linlin - admiral?
- Kaido (apprentice) - Dragon/Sakazuki but leaning towards dragon
- Pirate king Roger - hero of the marines Garp
As for why they were never really mentioned alongside sengoku or even Garp maybe they were simply not that notable in comparison. Same way shiki and Linlin while strong in their own right weren’t really comparable to whitebeard or Roger