User blog comment:FairyRaven/Fairy Tail Chapter 429 & 430: Code Blue & Purification Ritual, Review and Commentary/@comment-4933386-20150420123137/@comment-4933386-20150422101913

the first time she used star dress, i'm sure not just me, everyone was excited to see what power it brings... so far it's letting everyone down.

I reckon the next step of the star dress would be transforming without summoning the spirit, which means Aquarius dress will be used. then her magic advance again to be able to summon without using keys or using the dress. hence aquarius is summoned without keys.