Board Thread:Spoilers!/@comment-5899967-20160321134614/@comment-24674051-20160322043058

Hades likes to maintain control of the souls that enter his domain. Which is not too far off of the Greek Mythos in that regard. Whatever happened with Black Tooth, it did not count as a soul exiting. However, would Cora really have the power to send someone on to Tartarus? My understanding is that the only way for someone to exit the Underworld is to complete their business. and I get the feeling that leaving the UW would cause a clock tick, regardless of direction. So I'm not convinced that Black Tooth has left the UW, He's just in a different part of the UW.

As for step mother/step daughter/step grandaughter (Regina/Snow/Emma), If Hades is keeping their souls in the UW, then they are, for practical purposes, dead, with unfinished business. said business being leaving the UW, complete with Killian in tow. That's my thoughts, anyway.