Board Thread:Spoilers!/@comment-26443838-20160203031256/@comment-25926288-20160216224620

8Rob wrote: I'd say it's both: power and intellect

Every Dark One has the previous Dark Ones in his/her mind

It's imposible that Zelena is smarter that all the knowledge of the previous Dark Ones combined Lol, doubt it, but I'm certain Nimue wouldn't want any DO to go back in time, for security reasons. Plus, why would any go back in time?

Zelena is just focused towards a goal and capable of acheiving it. Plus, she had knowledge from Oz, whereas the DO was centered in the Enchanted Forest.