Board Thread:Spoilers!/@comment-6175354-20151221210207/@comment-24674051-20160103032358

Ok, so here is the theories that I saw above, bullet pointed.

Rumple - Killing Pan and Himself, resurrected and Replaced by Bae.

David - Killed by Snow, resurrected by Snow & Regina

Robin - Killed by Percival, resurrected by Emma, Price paid by the Guardian Nevengers

Hook - First death from Excalibur wound, resurrected by Emma

These are all assuming taht the interactions took place in Hades, that has never been clarified, to my knowledge.

Going outside of hades, Cases could be made for anyone...

Snow - Young snow walking back with Candle, and Hades intercepts her and dissuades her. (Wants Cora by the candle later)

Regina - Sits and has a nice tea with Regina to thank her for all the souls that she has sent to him

Zelena - Maybe has something to do with how Zelena got access to the Book of Prophecies in OZ

Snow/David/Henry - maybe a side effect of the sleeping curse allowed one or more of them to meet Hades (I vote Henry in this case).

Belle - Perhaps Collette made a deal with Hades to take her rather than Belle during the Ogre attack. The original outcome was meant to be the death of Belle. This is part of the reason that Belle does not remember all the details, and even Maurice may not even know everything.