1. You have Lavender in your sig...
Well, to answer your question, she's one of the best units at endgame and one of the best event units in general. There's no reason to pass her up now, even if her revival will eventually become permanent down the line.
2. It's supposed to represent base/evolved/bloomed (like the red/blue arrows in Aigis for CC/AW), but it's not supposed to be here yet and it isn't working properly anyway.