Re: Which Yonkou does Law want to take down?
Would you care to explain what you mean by "don't understand the character"? One Piece is a children's comic, and not terribly complicated. This is not exactly Proust. I do think it quite rude to say that anyone who thinks Luffy will become a Yonkou has little understanding of his character. Not only would that be untrue, but demonstrate an almost total lack of understanding for everything that has happened since Hodi Jones was defeated.
Luffy does not have to seek to become a Yonkou, or make plans. Quite the opposite. His path towards the position seems to be following the usual haphazard path. He declared war on Big Mam with little thought ofthe consequences, proclaimed himself protector of Fishman Island, stumbled upon Punk Hazard, where he was reunited with Law, forming an alliance to defeat one of the Yonkou. Without any plans, Luffy has triggered a series of events that will lead him to fight, and defeat one of the Yonkou. All by whim, all with a total disregard for planning and tactics. The title of Yonkou seems to be given by popular acclaim. Luffy need not care whether he gets the title or not, it will simply be given to him. Luffy is not so dumb as to forget something as important as becoming a Yonkou. Nor will forgetting be possible. After becoming a Yonkou the world will not let him forget.
Since entering the Grand Line, the entire manga has practically been about the rapid rise in power, prestige, and notoriety of the Straw Hats. First, as unknowns, they defeated a Shichibukai. They then invaded Enes Lobby, defeated a Buster Call, and destroyed the island of justice. Next they defeated a second Shichibukai. Luffy then assaulted a Tenryuubito. He then successfully led a jail break from Ines Lobby, before fighting in the War. In the New World, why would the story suddenly revert to East Blue? He's already challenged Big Mam, and allied with Law to defeat a Yonkou. He will soon defeat Doflamingo, raising his prestige even before he fights Big Mam. Wouldn't the only logical culmination of all this plot development be for Luffy to be proclaimed a Yonkou himself, whether he cares or not? The story could then progress with Luffy now longer the challenger, but a power himself.