User blog comment:AYET/Additional talks about chapter 699/@comment-4899461-20130225055407

The biggest enemy of the World Government is the Yonko. If Law and Luffy have allied to take down a Yonko, it's in the government's best interest to let them do it. It's great news for the Marines if one of the 4 largest pirate organizations is taken down without them having to lift a finger. However, the thing that would be concerning to them is how powerful Law and Luffy would become after Kaido goes down. So if the WG was going to do something about Law, they would do it after a Yonko is taken out, not before.