User blog comment:CoolJazzman/Genshirō Okikiba could he be a traitor?/@comment-26420452-20131021175546/@comment-11051098-20131022162224

It does seem like the Wandenreich have been able to spy on the Gotei 13 from the Shadow-side they've been hiding in. I would imagine they were prepared enough, and cooperating with a Shinigami would be of no need.