Board Thread:Spoilers!/@comment-27060727-20171014181959/@comment-1916997-20171015033756

Just thought I'd mention this as well: Oz traditionally has 4 Wicked Witches (North, South, East, and West) and 2 Good Witches (North and South). The Good Witches overthrow the Wicked Witches of the North and South respectivly, and then Dorothy kills the Wicked Witches of the East and West. On Once though, we saw what appeared to be 3 Good Witches, so let's assume in Once's canon the Wicked Witches were defeated already. That means that Zelena would be the 8th witch, she was meant to be the Good Witch of the West.