Its okay if you had Jinbe vs Jack as your opinion.
But ill stick with Inu + Neko vs Jack and Sasaki vs Jinbe.
You got people in alignment about this, don't worry.
A good story doesn't make all of the protagonists equally overshadow other characters in the story.
A good story allows secondary protagonists to also shine and have payoff.
I vehemently believe Sanji and Jinbe will have great fights. But I disagree they will be against YC's like Luffy/Zoro.
There are other Supernova captains who act as Luffy and Zoro's rivals and require plot payoff. For them to be overshadowed by Luffy's 3rd and 4th strongest members is where it becomes overkill.
Oda did this wonderfully at DR, where only Zoro really took out an executive. The rest were done by secondary protagonists and Franky.
We have 3x the villains this arc, and where Sanji/Jinbe can have plenty of interesting setups that don't require them surpassing billion bounty Calamities in one arc. The room needs to be left for other higher powerhouses in the story to do their thing.