Board Thread:Spoilers!/@comment-27060727-20160225003107/@comment-24674051-20160227191056

You know, Even with a Robin-Centric, they could not tie up Marian's unfinished business. because I am sure that part of it would concern Roland, who is (happily) not in the UW, but back with the Nuns in Storybrooke.

So there really is no need for Marian to return.