User blog comment:Firefist553/How will they beat him?/@comment-77.49.160.106-20111207091358/@comment-178.128.46.156-20111208133958

well since he didnt mention it in his attack(gomu gomu vulcanize no elephant gun) i think its the haki.thicker stronger layer of haki.the vulcanize theory is neat but if he can harden it then he can soften it too like a caoutsuk semi logia type.in the same theory crocodile can make his sand glass like.in vulcanization it is needed to add xtra molecules to change rubber.luffy change it by himself.its the haki layer.its strong.rayleigh said that people characters leads them 2 have  more advanced one of the two haki.luffys charachter leans towards strong attack haki.like cobbies character leans toward observation haki.im sure that colour was the haki. whitebeard thirst for payback hold him alive when he attacked akainu.he could touch him but not xtra hurt him.he was almost dead.if he could control it all he could have killed akainu. being the strongest in the world which is a title doesnt mean he is.time had taken most of his power.he was the strongest.then the next generation came.circle of life mate.