Board Thread:Spoilers!/@comment-24386552-20140609002306/@comment-6175354-20140609004308

Elsa could only be appearing in the first 9 episodes, because the next two episodes need to setup the 4.B arc. Zelena did not "appear" in the Season 3 finale. While Peter Pan did appear in 11 episodes, 3.10 and 3.11 setup sending everyone back to the Enchanted Forest.