User blog comment:FairyRaven/Fairy Tail Chapter 406: The Girl Within the Crystal, Review and Commentary/@comment-4489126-20141027130935/@comment-4449950-20141028054427

On the train on my phone, so I hope this works, but to answer your question Nick, it's why.

I mean, yes, we know the what for both stories. Mavis ends up frozen and the Spirits become good. But, for Eclipse, we also know the why: they become good again because they were good to begin with. To me the how isn't important, we just know why. However, for Mavis the why is still a mystery. Because of Zeref? Because she is dying and they try to save her? Spell gone wrong? We have no clue and that is the difference and why FT0 is so intriguing and Eclipse not... at least for me :)