User blog comment:IamJakuhoRaikoben/Chapter 446: The Land Abandoned By God, Review./@comment-5303512-20150727051623/@comment-1776824-20150729053056

The Aquarius Form was just a preview of what Lucy was going to get later on. Lucy didn't activate the form of her own will, it was forcibly activated by the Celestial Spirit King because Aquarius' key was broken and it would give Lucy a boost in stamina and power. They also don't run off of two different power sources (I don't even get this part of the comment, really). And how Star Dress works is Lucy uses the keys on her own body to temporarily gain the power of that spirit. She doesn't combine the dress with the key or anything like that; the dress is the result of the key being used. When aesthetically and fundamentally they are the exact same thing, how you can say they're different?