User blog comment:Omega natsu2/Chapter 371: Tartarus Arc, Part 2: Song Of The Heavenly Dragon, Predictions./@comment-86.70.179.7-20140210084523/@comment-24264679-20140212181901

I don't know kinda looks like the Edolas Dragon Chain key but why would it be put with Lucy Celestial keys. Byro did mention something about Celestial magic having a similar essence to anime.

Maybe and Maybe not. Although I do wonder what presents Lucy received from her father. IF Draco was summoned he wouldn't have to be weaker than the zodiacs either. Zodiacs are powerful keys but clearly not the most powerful as you have the Celestial spirit king. The key wouldn't even have to be Gold. Powerful keys isn't restricted tot he Zodiacs. They are just a set of powerful keys there is a stronger key than all them put together (Celestial spirit king) and there could easily be more.