Talk:TBA/@comment-209.171.88.102-20150705185204/@comment-50.149.169.214-20150714165716

You should keep one copy of every single Rare Summon unit you obtain (keeping whichever has the better typing when you get dupes), just in case. I've done so comfortably for two years, so don't say you don't have room. Spending a gem or two on unit capacity is more than worth it to avoid disposing of units who current maximum form aren't too useful, but may get a new evolution down the line... and/or have a use you didn't think of before or that a combo with a new unit makes possible. That goes for any unit with limited availability too, like Vortex units and such. You'd be surprised how slowly they really do fill up your space with the amount of repeat summons you likely get.

You don't have level them (in fact, some GGQs have limited cost to fill, so it's good to have some lower evolution units laying around to choose from), just keep them in case. I've heard too many lament fusing or trading in their Michele or Melchio, who are getting fantastic 7*s a few months from now (especially Melchio).