User blog comment:B214/Chapter 383 Surfing Lucy thoughts and analysis/@comment-197.226.178.50-20140509121045/@comment-7418318-20140509124831

Maybe because Aquarius is an unreliable bitch that is just as likely to leave you flapping in the breeze or attack you along with the enemy as she is to actually help.

She is sort of a last resort gamble, rather than a reliable ally.