User blog comment:The big croc/straw hats haki/@comment-3075024-20101213220350

I think that the Monster Trio are the ones that need haki cause they are the one who will fight the Vice-Admirals and Admirals. Also to fight the New World's top Pirates, they need to master any one of those. Luffy has it all but zoro and sanji need more. Busōshoku Haki can help them to kick and cut those logia users and will also make their every attack 100times stronger, just like Mihawk increses the size of his slash using his Haki(i think he has it). it will also protect them from physical attacks as demostreted by Rayleigh and the giant elephant.