Board Thread:Character Discussion/@comment-13019683-20140901180344

Here's my not-so-impossible theory about the return of Zoso. After returning home, Hans is exiled to the dishonor that has resulted, during the exile continues to believe Elsa responsible for his downfall and so he decides to take revenge but he realizes that the only way to defeat it is to use magic. Wanting to be like Elsa, Hans becomes the apprentice to a powerful wizard/witch (perhaps Mitchell's character or the Evil Troll of the original tale), but his magic is too little to be like Elsa so he and his teacher use the Vault of the Dark One (which I think is the Cauldron Black) for donor Hans greater power. However, all magic comes at a price and Hans' life is linked to the dagger (like Jafar with the lamp in Aladdin). As his old identity is dead, Hans rename Zoso and this name appears on the dagger as part of the necessary elements to control it.

Since Mitchell is most likely the antagonist of 4A, you may find that you need to Elsa for some reason and it is revealed that prevented Zoso to kill her and her locked up in the urn while the dagger is given to someone (perhaps the aforementioned Duke of Frontierland or an ancestor) explaining why Zoso / Hans, who wanted to rule Arendelle, is so eager to die. 