Revival apparently has costs. That cost is that they wouldn't be the same. When Anastasia was revived with magic, she was under the influence that she was in love with Jafar. When Daniel and Gerhardt were revived per science, their souls must have been rudely forced back into their bodies and made them monstrous. Also, it was probably Daniel's fate to die (In this OUAT universe), as when he was brought back by Whale, he said something to Regina to make it stop. Meaning that if she would have kept him alive, he would be someone else, forever in pain, and never okay. Like Rumple was when he had both his mind and his son's mind. It only ended when one of them died.

Jafar brought Ana back to life, then put a spell on her.
Like what he did with his father.

I think Zelena is dead, but she'll be back next year in flashbacks. Why do I think this? Both things were confirmed by Adam and Eddie.

Like everyone else has mentioned, Zelena is likely not dead, since her life force is anchored to the pendent (although her body might well be destroyed). I wonder if her life force is going to end up in another's body (we did see ghostly procession of Cora with Snow as well as Rumples with Neil) - I see the following candidates: 1) Regina - due to having a blood relationship (and Regina has her pendent). 2) Elsa\The Frost Queen - ends up getting the pendent 3) Emma maybe - ends up getting the pendent, would be the ideal instrument to get rid of Regina...

Yeah, Zelena's most likely alive within the pendant.

OMG I'd love it to be Emma that gets possessed by Zelena if the writers decide to go that angle.

If I remember correctly, it's her magic that's inside the pendant, not her life force. I really think she's a goner...

^ Yeah, could very well be. After seeing the finale, my suspicions that Zelena may still be alive are greatly diminished. 

If that green smoke was in some way Zelena's essence/soul/life force or whatever and it went into the portal then surely it would have tried to change history...but it clearly didn't. So if we go with the principle of easiest explanation, then it was probs just her magic. 

Don't get me wrong, I thought the whole "it's her magic granting her final wish" thing to be pretty damn weak. But it would seem to be the writers' genuine intention. 

I'm pretty sure they won't kill of rumple because he told a lie dont get me wrong I HATED what he did but he's one of the main characters i don't think some people would be able to survive more than a few episodes where rumples dead like actually dead plus belle is the forgiving type and it said his proposal was genuine and he still loved her he just needed his dagger to do something belle wouldnt let her do like kill zelena and anyway i think zelena is dead i mean she turned into a china than broke into a million pieces but i think zelena if she is alive and thats a big if than she might be in the second 11 episodes of season 4 because they have elsa to worry about now they might just forget zelena i mean elsas here!

I hope the Oz arc isn't over with. I could see all kinds of ways they could bring Zelena back, but if she's dead and Oz moves on, I'd be happy with that.

Plus, the Wicked Witch of the West was not the greatest threat Oz ever faced in the books, if any one character holds that title it's probably the Nome King, Mombi or the First and Foremost of the Phanfasms. (there were some other bad threats in later Oz books by other authors, like the Mimics).

Mombi would be perfect on Once Upon a Time, either the one from the books who is skilled in transformations or even the head switching Langwidere combo version from Return to Oz.