User blog comment:IamJakuhoRaikoben/Chapter 384: Attack of the Stars, Review./@comment-24800928-20140517003600/@comment-66.131.141.186-20140517034539

I agree with Johnny, I mean, maybe the key itself isn't needed, but I believe for sure that there is more to know about the gold keys than what we already saw and Aquarius has to be reunited with the other Zodiacs at some point, even if it isn't as Lucy's spirit.

I'm thinking either something will happen inside the CSW or Lucy will find a way to summon Aquarius without her key.

There are so many things we don't know yet, why Layla died the same day the dragon disappeared, the link between Zeref and the keys, Sorano and Yukino haven't been reunited, we don't know for sure Master Bob's link with the Celestial Spirits and the Pegasus constellation and there are so many constellations we haven't met yet.