User blog comment:IamJakuhoRaikoben/Chapter 384: Attack of the Stars, Review./@comment-3424593-20140516074407/@comment-7418318-20140517083434

While I hope (and expect) that the key will be fixed eventually, I'd prefer it if it would only happen much later. Lucy having to cope with the loss for some time could make for some great emotional scenes.

As Reli said over in the anime review blog, a scene with Lucy being in water and trying to go for Aquarius' key out of habit and then realizing that she no longer has it would be heartbreaking if done right.