User blog comment:Blackendedsoul/Why not Shiki?/@comment-220.255.1.56-20110322213218

simple.he is a rival.but he go after skirmishes and plan for months and even years.put it in an example.2 months of his planning = 2 months of roger going around killing/owning pirates or other people.Which one is more threatening?Roger isn't it?Regardless what or who roger child gonna be.He is supposed to be exacuted even before his death!And manage to capture him why not kill him?Same thing about whitebeard.Why did't they kill whitebeard then.cause he is not much of a threat to the marines in pirating terms.He is in it for the family.And they sort of using him as a yonkou.