Board Thread:Spoilers!/@comment-4725053-20160512134817/@comment-25375217-20160513172005

Yes, Robin not returning is likely not story based, but if their plan was to revive Robin Hood eventually (or to give the crystal the power to do so), they would have told Sean Maguire to be ready to come back. If he said no, then they would scrap that plan.

Unless they do it in a comic book only, there is no way to have the crystal revive destroyed souls and explain why they wouldn't bring back Robin Hood. At least, not that I can think of.