User blog comment:Dinosel/One Piece Discussion/Theory! Shanks' Arm!/@comment-27930128-20160719123259

The Sea Kings are enormously huge and the size itself could easily make anybody afraid of it. As much I could remember, there are only few scenes which involve fighting with sea kings. 1) Luffy easily defeat the sea king when he starts his journey. 2) Rayleigh defeated a sea king when travelling to Rusukaina. 3) The second time Luffy fights mermen, Arlong and Hody.

My idea is, we don't know how strong is the sea king. but when Luffy fight with Hody, a scene where Hody bit Luffy and Luffy said that he still cannot withstand that kind of attack with his armament haki because Luffy is still in development stage.

Maybe the same situation goes for Shanks. Armament haki still in development stage and not because of Oda's undevelop idea.

I believe that if Shanks didn't lose his arm, Shanks still meet WB and tell him about Luffy's personalities since Shanks spend a year with Luffy. And of course Shanks sensed Roger's will inside luffy.