the people who said Brook will not join because he will directly go back to Laboon have to explain someting to me : how will he do that? unless he suddenly and miraculously find an EP to reverse mountain he only have 2 solution :
1 he follow Luffy to the end of GL
2 he cross the calm belt and then pass reverse mountain again
and I also believe a squeleton will have trouble if he travel alone.
and please, he is NOT a swordman. he is a musician who use a sword to fight.
with the logic "he use a sword = he is a swordman", we have Luffy, Robin, Chopper : DF users… my god, Robin and Chopper must leave the crew immediatly ! !
and before someone says :" but its not the same DF", I will answer : " but it's not the same sword fighting style"