Board Thread:Fanon Canon 2/@comment-25152698-20140923215106/@comment-25152698-20140924130245

Good question, though this is left unanswered canonically. The fact of the matter is, we don't know why, but they didn't go after the Kaguya, this much is factual, as seen with Kimimaro.

I cannot answer your question, as it is meant more so for Kishimoto, I can, however, provide you with my own personal belief, nothing more, nothing less.