Hmmm, I'm not sure about the Hollow thing, is that the shape of Ino's Soul, or is that the White Shadow ?
Summons... so, is Sasuke, Naruto and Hinato the only ones with them ? The answer is no, so why weren't they used up until now by other ninja (Temari had a Kamaitachi styled one ) ?
So, is Katsui the only Slug that can be summoned and only in her full form, or can be a part of her summoned ? If so, it would have helped Sakura heal people and herself along the way through most of this series...
Somehow the more I look at their growing up forms, the more they remind me of Joker :p.