Well it’s mostly because oda decided to pair jinbe with Franky and Robin. And yeah I think saying they get low diffed is incredibly fair.
Jimbei teamed up with Sanji in the Fishman Island match-ups.
Keep in mind Zoro, Sanji, and Jimbei's fights had the versus title box in the same chapter.
Usopp, Chopper, Franky, and Brook's versus title box was in the next chapter.
Jimbei stood at the forefront with Luffy, Zoro, and Sanji in this group shot.
He accompanied Luffy with Sanji to the rooftop.
As Zoro and Sanji stood side by side with Luffy, Jimbei had his back in this colorspread.
Jimbei was the SECOND most important Straw Hat in Whole Cake Island down to being in an almost similar dilemma to Sanji. If anything, Jimbei had pairings with Sanji.
Fighting a Tobi Roppo (because Jack was taken) =/= Robin and Franky portrayal
I can't fathom how match-ups matter to you when determining Jimbei's power level but suddenly don't when you want to whiteknight the contradictions of Chopper being in the weak trio (who got the stronger opponent over Franky in Enies Lobby).
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Let's not forget Burgess (who had the best portrayal among Blackbeard's initial members and is portrayed as one of his top men) blatantly mirrors Jimbei.