Just a hypothesis, but lower star cards of the same costume may increase the level limit on higher star cards of the same costume. That's probably why they come with the 5 stars in the event awards.
Also, does anyone know of an easy way to delete friend requests? :C I have 50 filling up my box and it's too much of a hassle to delete them all only for more to come.
EDIT: Also, thanks for the tip on 6-1! I probably should have known this earlier @_@
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