He has to prove why he is in monster quartet Maybe he does something saving the crew like he did with the alliance
I think Jinbei might do a bit of what Sanji once was so loved for - take a step back, calmly analyze the situation, consider all possibilities and then take action based on what he believes is the best outcome.
We know that he is quite strong, he is calm and knows that too. But as he said himself in WCI, or if it was in Wano, he had started to realize that his role on the crew would have to be that of a calm observer. It must have been in Wano when Robin fell in love with him, somebody please find that panel.
It's only natural as Jinbei is by far the oldest and most experienced man and pirate (Brook lost 50 years or whatever doing nothing). He knows it's stupid to have all spring to action or run around at the same time. Somebody needs to act like Sanji once was known for, Katakuri did for a bit or as Mr Go. Law, Rayleigh, Whitebeard, Sengoku have it in them too if afforded the time.