I'll keep it simple. Whitebeard = bisento Blackbeard = flintlocks Big Mom = Napoleon Shanks = sword Kaido = kanabo Luffy = sword ? It has been known that the all the Yonkos introduced so far have their go-to weapons with which they can deliver devastating blows (with the exception that BB not being seen using his flintlock, though he carries it everywhere). Since Luffy is being called as the fifth emperor of the sea, it makes us wonder if he can, in future, implement the sword he is seen carrying in Wano arc into his attacks. What do you think?