In Chapter 800, the narrator stated that the Grand Fleet would trigger an incident of historic proportions. Now, Shanks his on his way to beat Barto up, because he burned a Redhair flag. Threatening him but letting him off easy in the end, because he a subordinate of Luffy, would not really be an incident of historic proportions. Instead Shanks will either hand Barto to the marines, or he will let hem lay there half dead so that some navy officer can then pick him up without much effort. Greenbull and the ship he called should still be close.
