Koby Vs. Luffy Final Battle EoS
Eventually everyone thinks that Luffy is going to fight Koby and it will be because Luffy has pirate ideals and these ideals will clash with the new order that Koby wants to impose. There is no place for Luffy's kind of reckless behavior in this world even if he thinks he is bringing about great changes.
Let's say it goes down like this... Luffy wins every other fight. He says he has brought peace, freedom, justice and security to this new empire he creates when he destroys the World Government and the other pirate affairs that lead to civilians being put in danger. Luffy has accomplished most things including getting the One Piece, but Koby still fights for a sense of justice he says goes beyond Luffy's ambition.
Koby suggests things like the world Luffy wants to create is crazy, and that he will stop him from going any further. For example, when world peace is created Luffy may want to let people create unique technologies. This is liberal in the sense that Koby has conservative opinions about what should be done with allocated resources. It is known that the people on the moon ran out of resources. Is it possible that when this kind of philosophy Luffy promotes becomes widespread that people begin to use resources recklessly and in the past it caused them to need to move from place to place?
Maybe Koby wants to protect the earth and the way Luffy uses it is somewhat abusive to it because when he lets people have freedom the technology becomes dangerous to everyone?
Who will win? Luffy's ambition to fulfill his dream or Koby's dream meaning his own sense of justice?