I don't think you can release your starter pokemon actually? I read that somewhere but I could be wrong. Mines in my box too though, I just use it to send on rumble missions lol.
I think the purple is my favorite feather, it's definitely underrated. And omg I hatched soooooo many eggs (I had a chain of about 1500) and I leveled up a TON.
I might try to get a pink or purple feather once I get the rest of my entry tickets, or I might buy the other two glow wands...it's too hard of a decision lol. I guess I'll see what's left once I have more tickets!