User blog comment:Kaido King of the Beasts/Chapter 806: Jacked Off the Island/@comment-26803131-20151105135132/@comment-24850639-20151105164857

I'm not too sold on anyone yet, but here's my thoughts at the moment:

Raizo/The Samurai - (Ch. 793) During the aftermath of Mingo's defeat, we're shown a "certain" island that Drake is on. The trees are growing in an odd fashion, very similar to bonsai trees. Bonsai trees are of course a very traditional aspect of Japanese culture, and the large black figure in the panel upon closer look to me, appears to resemble and old Japanese temple. I think this is actually Kaido's base.......in the WANO COUNTRY. I think Kaido having strong ties to Wano explains Kanjuro's and Kin'emon's dodginess when it comes to explaining their mission, and why Kin'emon and Momo freaked out so greatly when SH-Law alliance revealed Kaido was the target. Their group could be on some kind of crusade against Kaido as well, and havent given all the details yet for some unknown reason. He could have shown up in response to the one chick in Sheepshead's group saying that she was going to report that the Samurai wasn't there. Jack may have gotten the report and decided to go investigate on his own. Oda seemed intentional about making sure the Samurai didn't arrive the same time as Luffy's group, so I'm sure there's a compelling storyline involving them on Zou too.

Luffy - Caesar and Mingo, two extremely important assets to Kaido, have both been taken down, and it was made rather obvious that Luffy was responsible in both cases. Jack's subordinates were watching as he beat Caesar, and the newspaper made sure everyone knew about his role in beating Mingo. I think its reasonable to assume that Kaido's subordinates would be able to guess that the Law-SH alliance is targeting them. So perhaps he heard somewhere that Law's crew was there, or that Luffy's crew was there, or figured that Zou could have been their next target.

Law - Same reasons as Luffy for the most part, though maybe more so for being the mastermind that got everything set in motion against Kaido than his direct actions.