knowing that Zoro is pretty bad with directions, he might be getting lost again, especially that the ship is so huge that the village can fit inside it. Reaching Brooke and Ryuuma will be a matter of Zoro's luck.
I noticed that one thing that gives us the idea of Brooke not joining the Straw Hats is because he uses sword. Of course, the idea of two sword-using crew sucks. Of course, each member possess different characteristics and fighting abilites. There is a rubber man, a doctor, a shipwright, a sniper, a swordsman, a cook, a navigator, and a historian. But just because Brooke uses swords doesn't mean that he is in fact a swordsman. In previous chapters, he describes himself as "the musician of their crew," meaning he thinks of himself as a musician, not a swordsman. Besides, Brooke will still have his own distinctive style even if he uses swrods. It would be like Sanji and Luffy who are both using their combat skills in fighting but each of them has their own style
