It really depends on what structure Oda is going for.
It can be
1) Captain and his right hand man, with Zoro being a high diff opponent for Luffy and the rest of the crew significantly below (Sanji Y1C to low top tier), then Jinbe does not need a powerup, like i said new leader of the mid group
2) Captain and his right and left hand man, which only means Sanji is stronger than above, no influence on Jinbe, stays leader of mid group (which is really the age and maturity group of the Strawhats, so he fits in really, at least personality-wise)
3) Captain and below him his 3 commander like guys, which would entail Jinbe needing a powerup to at least Y1C