Board Thread:Fanon Canon 2/@comment-25152698-20140923215106/@comment-25152698-20140924023106

Here is an example of a kirigakure shinobi who can use the said technique, yay example.

Also, we are told that:

Being a rare possessor of the clan's Shikotsumyaku kekkei genkai, the clan patriarch feared Kimimaro's abilities and had him locked up in a cage unless needed for battle.

Keyword here is Kimimaro. So that Kaguya did not imprison anyone until witnessing Kimimaro's prowess, which invoked fear. They were not afraid of Hiraku until they saw what his kg was possible of, through Kimimaro.