factual power scaling:
it might be absurd to put Jinbei and Franky on the same level, but Sasaki and Who's Who's were portrayed in a similar regard before the fighting took off, both were really eyeing that all-star spot. I'd say Jinbei is most likely stronger but I wouldn't rule out Franky matching that strength with the General Franky. Zoro and Sanji is obviously Zoro being stronger more often than not, but they often get portrayed as equals too. Robin and Brook is kind of nebulous but Robin has a way more busted fruit. Chopper and Nami is also nebulous, especially with Nami constantly gaining powerups, but Chopper's monster point managed against an all-star for some amount of time. Love Usopp but Oda's said he's the weakest.