User blog comment:MagnoCosmos/Celestial Spirits Ranking/@comment-1153699-20150907164700/@comment-177.97.255.238-20150907214911

Lucy' MP is high enough so that she could summon 3 spirits at once while remains awake, and she had already summoned Sagittarius before those 3. After that, she still had enough MP to summon the CSK. I think that Gemini would be pretty useful to her if she had them copied Wendy, Juvia, Cana and etc.