Board Thread:Spoilers!/@comment-413929-20151029063935/@comment-4877635-20151104190116

Because they make up the mythos of the show. Sidney was a key player in season 1 along with Kathryn and Cora and Pan were the two major villains on the show to display a threat. The other was Zelena and she is now starring. The Blind Witch had the poisoned apple so was linked to the Snow White story, what OUaT is mainly about.