User blog comment:Kaido King of the Beasts/Chapter 801: Another Game of Thrones/@comment-24850639-20150924162103/@comment-2226235-20150925155320

It's more likely that he knows something the marines want to find out or he found something the marines want. I doubt that was foreshadowing since that's not really Oda's style. Oda generally foreshadows things through small details that characters mention that turn out to have much greater significance later. Visual foreshadowing isn't his style.