Theory Luffy’s Dream and End of Onepiece

Barto was crying when Luffy said that he wants to be Pirate King. Whatever Luffy will say, Barto will cry and lose his mind.

Giants from other hand always laughing.

Nami is different, and if I judge I will look on her reaction first to understand what Luffy's dream is about
Barto wasn’t crying simply because Luffy wants to become PK. Barto knew that already. He started crying because of Luffy’s definition of King.