The funny thing about the all blue is it being the only dream where the strawhat doesn't have to do anything, and still get to accomplish their dream by the merit of being on PK's crew
Pirate King: defeat the emperors and the navy
WSS: defeat Mihawk
Map: navigate the world and chart maps
Brave Warrior: Ussop has to improve himself
Cure for all diseases: be a good doctor
Void history: decipher the ponyglyphs
Greatest ship: continously improve the Sunny
Brook: survive florian triangle for 50 years
Jinbe:become ambassador for fishmen and fight the world government
What does Sanji even do to accomplish his dream, Make Luffy the pirate king? All the strawhat do that..
Zoro has contributed as much as Sanji to finding the all blue. Nami as a navigator contributes more to that dream. When the story ends and the strawhats find the all blue, Luffy as a captain will get all the credit for finding the legendary sea..