When you say less chance, that's exactly what's gonna happen.
Well, I guess they were trying to make up a story or something. The previous Tastes of Fall you've been collecting will be used to summon a Raid Boss which gives Sunshine Drops when defeated. You will then need to bring those Sunshine Drops from the previous event to this event, whereby exposing them to snow will convert them into Shining Stars! Actually, it's more like I'm doing the creative storytelling for them XD
Dude, you should be proud of yourself that you got a 6-star Mistletoe! The hell man, why do you still want Ivy?! Wait, unless you like Rikka hehe............