Board Thread:Questions and Answers/@comment-10797017-20130627100621/@comment-11051098-20130715123203

His goal might be to destroy all Shinigami, like they once tried to destroy all Quincy. He has either way made it clear that his goal is the destruction of Seireitei, and by that I also read all Shinigami.

Kenpachi has a habit of underestimating his opponents, I think. He had who knows how much of his reiatsu suppressed, but he still won battles. But seeing as "everyone was too weak" to defeat him, except Ichigo and until recently Unohana, he could have underestimated them, until Royd/Yhwach effortlessly defeated him. And now that he's at his full power, he surely wants to return the deal, I think :P