one thing that can happen and that he can be an infiltrator in the crew seeking to know about the change that happened to Crocodile. It would make a lot of sense for him to be an infriuado, the guy has been brainwashed and is totally faithful to the celestial dragons
don't forget kaidos dragon fruit cloned by Vegapunk, you should steal it and give it to nami,
in the original work she controls the weather somewhat,
the dragon fruit can create clouds and control thunder
plus if you teach nami close combat, with the dragon fruit sue has yonko level potential
