in the previous chapters, kusakabe was said to have the role of jack... so in the first chapter the author make it that, what he found, and what the author make us see, is that kusakabe had found the card of jack, but in reality what he really found is 8 of diamonds (in chapter 5)
raws
http://www.77mh.com/colist_231468.html
Thanxxxx!!! (●'◡'●)ノ