User blog comment:IamJakuhoRaikoben/Chapter 501: Mari and Randi, Review./@comment-184.178.44.233-20160914195831

Isn't it already obvious that the Celestial Spirit King will likely participate in the Lucy vs Dimaria fight, which begs the question on how Lucy will plan of summoning the CSK. Will she sacrifice another gold key or will the power of 3 celestial mages be sufficient enough to summon the king? This is assuming that Yukino and Sorano are nearby since they were actually looking for Neinhart. I know that spirits need key to be summoned (or atleast be owned by the mage), but Aquarius did mention that the CSK does not have a key and it was more of a special requirement that is needed to summon the king. Perhaps 3 celestial mages can be an alternative requirement.