Yes, we know about that as you can see in the Petition, the point is, Edelweiss ability is almost unique, and there is a huge disadvantage for those of us that didnt know that this game exist at all and missed the event in order to wait 6 months until they release the Revival event (yes, the revival will happen in 6 months), thats why we are making this petition, to at least bring her back now with out any item slot before those 6 months, we dont even care so much about Lavy because she is good but is not so important as Edel.
And like i said, a Developer of Nutaku told us that if enough players ask for it, they could bring her back.